Green Lantern is a DC Comics superhero. Created by Martin Nodell and Bill Finger, the original Green Lantern debuted in All-American Comics #16 (1940).

Several individuals have assumed the identity of Green Lantern over the years. Each of them possessed a special ring called a power ring which gives them great control over the physical world as long as the wielder has sufficient willpower. While the ring of the Golden Age Green Lantern (Alan Scott) was magically powered, the rings worn by all subsequent Green Lanterns were the creations of the Guardians of the Universe who granted such rings to worthy candidates across the universe. These individuals made up the intergalactic police force known as the Green Lantern Corps.

The character was a relatively generic superhero until 1970, when DC paired the Silver Age Green Lantern (Hal Jordan) with the archer Green Arrow in a ground-breaking, socially conscious comic book series. This era helped make Green Lantern popular, although subsequent series took on a more cosmic theme. In the last twenty years, DC has placed different individuals in the role (most permanently Kyle Rayner and John Stewart), sometimes irking longtime fans.

Green Lantern is part of the all-star group the Justice League and is currently featured in the Justice League Unlimited animated series.


Publication history
Green Lantern (sometimes called The Green Lantern in the early days) was created by Martin Nodell and Bill Finger and first appeared in All-American Comics #16 (1940). This Green Lantern was Alan Scott, an engineer who had come into possession of a magic lantern. From this he crafted a power ring which gave him a wide variety of powers, and which had to be charged every 24 hours by touching it to the lantern for a time.

Scott was a founding member of the Justice Society of America, and starred in his own title, Green Lantern, during the 1940s. His adventures during the Golden Age of comic books came to an end when superheroes fell into disfavor in the industry in the early 1950s, when the JSA's adventures ended with All-Star Comics #57 (1951).

A few years later, DC Comics had successfully revived The Flash in a new incarnation, with the name and powers being used by an entirely new character, and it was decided that Green Lantern would be similarly revived. This Green Lantern was Hal Jordan, a test pilot who was given the ring by a dying alien, Abin Sur, and who became a member of the Green Lantern Corps, an interstellar organization of police overseen by the Guardians of the Universe. The Corps' rings were powerless against anything colored yellow. Jordan's creation was motivated by a desire to make him more of a science fiction hero (editor Julius Schwartz being a longtime SF fan and literary agent) to boost sales.

The Green Lantern Corps bears many similarities to the Lensmen from the stories of E.E. Doc Smith. The Lensmen, who hail from various alien races, bear a device known as the Lens which gives them enhanced physical and mental abilities, bequeathed to them by the advanced and benevolent Arisians. The Lensmen are the vanguard of the Galactic Patrol, an interstellar police force. However, both John Broome, writer of the early Hal Jordan tales, and Schwartz denied any connection. Broome, in particular, denied all knowledge of Smith's stories. Schwartz also denied reading them, although he admitted that, as an SF fan, he had of course heard of them.

This Green Lantern was a member of the Justice League of America and starred in his own title, and eventually met his predecessor, who was established to live on the parallel world of Earth-Two, separate from Jordan's Earth-One. The two Lanterns struck up a close friendship and periodically come to each other's aid in various adventures.

By the late 1960s, however, Green Lantern's popularity was flagging. Green Lantern writers Denny O'Neil and Neal Adams attempted to spark new interest in the book by adding the character Green Arrow to the series, and having them travel through America encountering various "real world" issues, to which they reacted in different ways, Green Lantern being fundamentally a lawman while Green Arrow was a liberal iconoclast. The experiment was years ahead of its time, on the strength of Adams' stunning photorealistic artwork and O'Neil's intelligent and thought provoking (but often heavy-handed) stories; and was not a commercial success. DC editor Julius Schwartz dubbed it "relevance" and the Adams/O'Neil era was one of the earliest efforts of comic books to become more than light fantasy.

During the 1970s and 1980s, the focus of the series (which was cancelled and restarted several times) gradually shifted from Jordan to the Green Lantern Corps as a whole. Jordan gave up the role for a time, surrendering his role to fellow Earthman John Stewart. After he took up the ring again, Jordan was joined by a legion of other Green Lanterns, both human and alien.

Few storylines in comics history provoked as much outrage and controversy as when writer Ron Marz wrote Emerald Twilight, detailing the end of Jordan's career. Sales had slumped again by the 1990's and an editorial decision was made to restart Green Lantern as a younger different character. In the story Jordan went insane following the destruction of his old home, Coast City, by the villainous alien Mongul. Jordan destroyed the Green Lantern Corps and the Guardians, absorbing their power and taking the name Parallax. One Guardian survived, however, and passed one remaining ring on to a randomly-chosen human named Kyle Rayner. This ring lacked the flaws of the earlier rings, and Rayner joined a new incarnation of the Justice League. Hal Jordan eventually returned as Green Lantern, and was cleared of the crimes committed as Parallax in a 2005 miniseries called Green Lantern: Rebirth that revealed that it was the work of a demonic entity that possessed Jordan (See below).


Biographies of the Major Green Lanterns

Golden Age Green Lantern (Alan Scott)
Thousands of years ago, a mystical "green flame" fell to Earth. The voice of the flame prophesied that it would act three times: Once to bring death, once to bring life, and once to bring power. By 1940, the flame had been fashioned into a metal lantern, which fell into the hands of Alan Scott, a young engineer. Following a railroad bridge collapse, the flame instructed Scott how to fashion a ring from its metal, to give him fantastic powers as the superhero Green Lantern. He adopted a colorful costume and became a crimefighter.

(Years later, the green flame would be retconned as the expunged magical characteristics of the Guardians of the Universe from the Earth-1 universe. This collective force was hidden in the heart of a star and became sentient, leading to its name of Starheart. A later story, placed after the Crisis on Infinite Earths, implied a connection to an ancient member of the Green Lantern Corps. A still-later story brought back the Starheart, although kept it in the single post-Crisis universe.)

Scott used his ring to fly, to walk through solid objects (by "moving through the fourth dimension"), to paralyze or blind people temporarily, to create rays of energy, sometimes solid objects, and force fields, to melt metal as with a blowtorch, to cause dangerous objects to glow, and even occasionally to read minds. His ring could protect him against any object made of metal (presumably because of the magical properties of the green meteorite metal), but would not protect him against wood, rubber (in the second story he is laid low by a rubber sap), or any other substance. After a time, however, his vulnerabilities were limited merely to wood.

Scott was a charter member of the Justice Society of America, beginning in All-Star Comics #3 (Winter 1940). He served as the team's second chairman, in #7, but departed following that issue, only to return a few years later. He has been a key member of the group ever since.

During the 1940s, Green Lantern seemed to alternate between serious adventure - particularly when his arch-nemesis, Solomon Grundy, appeared - and light comedy, such as his sidekick Doiby Dickles. Toward the end of his Golden Age adventures, he was even reduced to the role of a sidekick to Streak the Wonder Dog, a heroic canine cut from the mold of Rin-Tin-Tin and Lassie.

Scott was a member of the JSA in 1951 when the team was investigated by the House Un-American Activities Committee for possible Communist sympathies and asked to reveal their identities. The JSA declined, and most of the membership retired for the 1950s.

(One piece of retroactive continuity fills out early Scott history. All-Star Squadron Annual #3 states that the JSA fought a being who imbued them with energy that retarded their aging, allowing Scott and many others (as well as their spouses) to remain active into the late 20th century without infirmity. The events of that incident also lead to his taking a leave of absence from the JSA, explaining why the character vanished from the roster for a time.)

The team re-formed in the 1960s with Scott as a member, though little is known of their adventures during this time save for their team-ups with the Justice League of America of the parallel world Earth-1, and a few cross-universe adventures Scott shared with Earth-1's Green Lantern, Hal Jordan.

It was eventually revealed that in the late 1950s or early 1960s, Scott had married the woman with the dual identity Rose and Thorn, and the two had a pair of children who would grow up to become the superheroes Jade and Obsidian, of the team Infinity Inc..

In the late 1970s, Scott ran a broadcasting corporation, which was ruined by creditors. Scott was temporarily driven mad by the Psycho Pirate, but the rest of the JSA helped him back from the brink. His friend Jay Garrick helped him start a new career as a scientist.

In the 1980s, Scott married his longtime nemesis (now reformed), The Harlequin, and reconciled with his son and daughter. Following the Crisis on Infinite Earths, which merged all parallel realities into one, the source of Scott's power was revealed to be the mystical "Starheart", which additionally helped retard Scott's aging process. For a time, the Starheart was part of Scott's body and he adopted the name Sentinel, becoming a founding member of a new JSA.

Thanks to the rejuvenative properties of the Starheart, Scott is physically a man in his 30s or early 40s, and continues to fight crime in his costumed identity.


Silver Age Green Lantern (Hal Jordan)
The second Green Lantern was Hal Jordan, who in 1959 was a second-generation test pilot (having followed in the footsteps of his father, Martin Jordan) who was given the power ring and battery (lantern) by a dying alien named Abin Sur. When Abin Sur's spaceship crashed on Earth, the alien used his ring to seek out an individual to take his place as Green Lantern: someone who was "utterly honest and born without fear."

Though treated on Earth like a superhero, Jordan soon learned that Abin Sur was a member of an elite force of intergalactic police called the Green Lantern Corps, who worked for the Guardians of the Universe. Instead of one Green Lantern wielding a magic ring, there were 3600 Green Lanterns patrolling the entire universe. Their rings were powered by the central power battery at the planet Oa, where the Guardians lived. Oan power rings had to be recharged every 24 hours, and were ineffective against direct contact with the color yellow, due to a "necessary impurity" in the design of the rings. Jordan was assigned to patrol Sector 2814, in which Earth was located.

Jordan had a longtime on-again off-again love affair with his boss, Carol Ferris. He fought colorful 1960s villains such as Star Sapphire (a mind-altered Ferris), Hector Hammond, and the rogue Green Lantern, Sinestro. He was also a founding member of the Justice League of America in The Brave and the Bold #28 (1959).


Cover to Green Lantern #76 (April 1970), the first issue of the acclaimed Green Lantern/Green Arrow team-up series. Art by Neal Adams.In 1970, feeling the tension between dealing with the intergalactic problems of the Guardians and the individual, personal miseries on Earth, Jordan left his test pilot career behind and travelled across the United States with fellow hero Green Arrow in a "search for America", highlighted by tensions between the pair due to their different outlooks on life. The Guardians assigned one of their own to accompany the pair for a time, while temorarily reducing the power of their insubordinate Lantern's ring. One memorable scene from this period saw Green Lantern confronted by an elderly black man, who noted that the Green Lantern had done much for aliens with fantastic skin colors, but asked what he had done for the "black skins".

In the early 1980s, Jordan was exiled into space for a year by the Guardians in order to prove his loyalty to the Green Lantern Corps, having been accused of paying too much attention to Earth when he had an entire "sector" of the cosmos to patrol. When he returned to Earth, he found himself embroiled in a dispute with Carol Ferris. Faced with a choice between love and the power ring, Jordan chose to resign from the Green Lantern Corps. The Guardians called Jordan's backup, John Stewart, to regular duty as his replacement.

In 1985, the Crisis on Infinite Earths saw Jordan once again take up the mantle of Green Lantern, even as the Guardians withdrew from our dimension for a while. Jordan helped organize the new Corps, with seven members residing on Earth, including several aliens, John Stewart, and Jordan's slightly-unbalanced "other backup", Guy Gardner. For a while Jordan was romantically involved with a younger, alien Lantern named Arisia. The alien Lanterns took a more direct hand in human affairs, a fact not appreciated by human governments (Kilowog helped create the Rocket Reds for the Soviet Union). Eventually, the Earth corps broke up, several members returning to their home sectors.


Cover to Green Lantern #50 (March 1994). Hal Jordan becomes Parallax. Art by M.D. Bright.The Guardians soon returned to this dimension, and Jordan worked with them to rebuild the fractured Corps. Then the villainous alien Mongul came to Earth in a plot to take advantage of the death of Superman. Jordan defeated Mongul, but not before Coast City (Jordan's former home) was destroyed. He tried to use his ring to recreate the city, but the Guardians condemned this use of the ring for personal gain and demanded that Jordan come to Oa for trial. Angered at what he saw as the Guardians' ungrateful and callous behavior, Jordan went insane and attacked Oa to seize the full power of the central battery. The Green Lantern Corps attempted to defend Oa, but the enraged Jordan overwhelmed them, destroying his fellow Lanterns and the Guardians. He then renounced his life as Green Lantern, adopting the name Parallax.

As Parallax, he initiated the Zero Hour crisis, attempting to rewrite history to his own liking, but he was eventually defeated by a gathering of heroes. Ultimately, in the Final Night crossover, Jordan returned to his heroic roots, and reignited the Sun (which had been extinguished by the Sun-Eater), but died in the process.

A few years later, Jordan was resurrected as a new incarnation of The Spectre. Soon after assuming this mantle, Jordan chose to bend his mission from a spirit of vengeance to one of redemption. The new Spectre series based on this premise, however, only lasted 27 issues before being cancelled due to poor sales.

In 2005, DC finally brought back Hal Jordan as the "star" Green Lantern of Earth, and redeemed his image with the miniseries Green Lantern: Rebirth, written by Geoff Johns, and pencilled by Ethan Van Sciver, in which it was revealed that Parallax was actually an ancient demonic parasitic entity dating back to the dawn time, that actually was the sentient embodiment of fear, and which traveled from world to world, feeding off the fear of sentient beings, and causing entire civilizations to destroy themselves out of paranoia.

It was this creature, yellow in color, which the Guardians of the Universe imprisoned within the central Power Battery on Oa using fear's opposite energy, willpower. Parallax had lain dormant for billions of years, his true nature covered up by the Guardians to prevent anyone from trying to free it, and thus, it had eventually come to be referred to as simply "the yellow impurity." This was the reason why the rings were useless against the color yellow: Parallax weakened its power over the corresponding spectrum, and hence only someone capable of overcoming great fear could master the power ring. When the renegade Sinestro was later imprisoned in the Power Battery himself, his Qwardian yellow power ring tapped into Parallax's power and awakened it, allowing it to reach out to Hal Jordan through Jordan's own ring when Jordan was at his weakest, spending years influencing him, causing him increasing self-doubt, and even causing his hair to turn white at the temples. Parallax's control over Jordan exploded with Jordan's grief over the destruction of Coast City, and it was Parallax who was responsible for Jordan's subsequent murderous activity, his apparent killing of Sinestro (which was later revealed to be an illusion on Sinestro's part, created as the final stage of Jordan's susceptibility to the impurity in order to break his will), and Jordan's destruction of the Central Battery, which allowed Parallax to graft itself onto Jordan's soul.

It was because Parallax was now free that Kyle Rayner's own ring did not have any weakness against yellow, and the Spectre explained to Jordan that it drew in Jordan's soul in hopes of eradicating the parasitic Parallax from Jordan's soul. The Spirit of Vengeance eventually removed Parallax from Jordan's soul, and itself from Jordan, departing in order to move onto the next recipient of the Spirit, while Ganthet guided Jordan's soul back to his own body, which Ganthet had preserved after Jordan reignited the Sun during Final Night. His soul and thoughts finally clear for the first time in a long time, Jordan was resurrected as a mortal human again, once again taking his place as a Green Lantern, the white portions of his hair even restored to their original brown. He fought Sinestro, who revealed himself as alive for the first time since his faked death, forcing the renegade to retreat back into the antimatter universe. Together, Jordan, Kyle Rayner, John Stewart, Guy Gardner and Kilowog freed Ganthet, whom Parallax had possessed after his expulsion from Jordan's soul, and imprisoned the parasite back in the Central Power Battery on Oa.

DC Comics subsequently began a new Green Lantern starting with issue #1 (July 2005), with Hal Jordan once again the focal Green Lantern of the book. Trying to rebuild his life, Hal Jordan has moved to the almost deserted Coast City, which is slowly being reconstructed. He is now attempting to get a job flying once again with the United States Air Force.


Modern Age Green Lantern (Kyle Rayner)
Kyle Rayner was a struggling freelance artist when he was approached by the last Guardian of the Universe, Ganthet, to become a new Green Lantern with the last power ring. Ganthet did not choose Rayner for any particular reason; he simply needed to find someone to fill the role. Despite not being cut from the same cloth of bravery and fearlessness as Hal Jordan, Kyle Rayner proved to have his fans.

Kyle was a gifted artist and a fan of Japanese manga. To him, the Green Lantern ring was the ultimate expression of his imagination. While in battle, he often used rings to create constructs of other superheroes, anime characters, mystical characters, mechas, futuristic weapons and original characters from his comic books. While some questioned the practicality of those constructs, they often made Kyle an unpredictable opponent.

Rayner also joined the Justice League. He became friends with Alan Scott, the Golden Age Green Lantern, and his daughter Jade (also a Green Lantern previously). Kyle and Jade's relationship was a complicated but ever growing one. Their relationship went as far as Kyle proposing and Jade believing she was pregnant. His adventures have mostly been confined to Earth, with a brief period of godhood as the imposing Ion. Kyle's godlike powers had drawbacks: Ion was one with everything, but Kyle Rayner could no longer sleep or separate himself from the overwhelming responsibilities. Rather than sacrifice his humanity, Kyle abandoned omnipotence, bleeding off the vast power (recharging the Central Power Battery on the planet Oa and helping to create a new group of Guardians in the process). Once again limited only by his willpower and imagination, Rayner's ring can affect yellow and does not have a set time limit on its power, though prolonged use can leave it depleted and in need of recharging. After the brutal beating of his young assistant and friend Terry, Kyle went on a lengthy self-imposed exile into space. On his return he discovered that Jade had begun seeing someone new, and John Stewart had replaced him in the Justice League.

After being tricked, as part of a plot to steal his ring, into believing his mother had been murdered by Major Force, Kyle fought with the villain. Knowing Major Force was essentially immortal, Kyle decapitated him and shot his head off into space. Feeling that he was a danger to those he cared for, once again left for the far reaches of space.


Controversy

Cover to Green Lantern #64. Art by Darryl Banks.The editorial decision to turn Jordan into an homicidal maniac and replace him with Rayner was very controversial in comic book fandom, sparking a debate that has lasted for years in forums such as Usenet. Many fans consider the treatment of Jordan to be a betrayal of the character (some fans created a Jordan defense organization called H.E.A.T., "Hal's Emerald Advancement Team"), while other fans feel that Jordan's fate should not reflect badly on Rayner. Caught in the middle has been writer Ron Marz, who executed the editorial decision to replace Jordan with Rayner, and who has been defended as having done the best he could with a decision which was out of his hands.

The controversy is somewhat similar to that of replacing Barry Allen as The Flash with Wally West, except that Allen was, fans feel, given a heroic send-off while Jordan was not. Moreover, writer Mark Waid addressed the Allen/West controversy head-on and developed West into a fully-rounded character, while despite several attempts it is widely felt that no similar catharsis has been provided in the case of Green Lantern.

Another Jordan/Rayner controversy stemmed from the Green Lantern: Rebirth miniseries, which cleared Hal Jordan of the crimes he apparently committed as Parallax, and returned him to active duty as a Green Lantern, followed by a new Green Lantern series beginning with issue #1. With Jordan's return, Kyle Rayner's place in the pecking order is seen as uncertain, which some fans having preemptively protested the apparent retro move. However, it should be pointed out that Jordan's return means that Rayner will no longer be the "star" Green Lantern of the DC Universe, this does not necessarily mean that Rayner will disappear; Guy Gardner and John Stewart, for example, continued to be active presences throughout the decade of Jordan's absence as Green Lantern, and Gardner has now again become a GL himself. In addition, Rayner will be appearing in the Rann/Thanagar War miniseries. Following that, Rayner will co-star in a limited series called Green Lantern: Recharge with Kilowog and Guy Gardner. This has sparked further controversy due to writer (also of Rann/Thanagar War) Dave Gibbon's statements which claim that Rayner "doesn't have the soul of a Green Lantern."


Other Green Lanterns
The Green Lantern Corps had 3600 members at its peak. Some of the more notable ones:

Abin Sur was an alien (whose planet, like Earth, is also located in Sector 2814), who incongruously travelled using a spaceship, rather than the power of his ring. The Post-Crisis explanation for this was that a psychological attack by a group of exiled demons caused him to lose faith in his ring and sometimes use a ship instead. His ship crash-landed on Earth; as he lay dying, he passed his ring on to Hal Jordan.
Kilowog of Bolovax Vik (Sector 647) was an alien who recruited and trained new members of the Green Lantern Corps. His most illustrious student was Hal Jordan. When Jordan went insane, Kilowog was one of the last Green Lanterns to try stop Jordan from destroying the central battery. He was killed by Jordan, but his spirit was summoned by a group of ex-Green Lanterns bent on avenging the destruction of the Corps at Jordan's hands. He has subsequently been restored to life by Kyle Rayner. His is the only ring that makes a sound, as revealed in Green Lantern: Rebirth #6 (May 2005).
Guy Gardner is a former schoolteacher whom Abin Sur's ring selected as an alternative to Hal Jordan, but Jordan was closer so Sur chose him instead. Gardner later suffered brain damage, and was unbalanced when he recovered enough to function. He was awarded a ring by a rogue faction of Guardians during the Crisis on Infinite Earths. Eventually, forced to abandon his Green Lantern Ring, Guy acquired the yellow power ring of Sinestro and his own comic series began with him using that ring. The yellow ring did not use a battery to recharge but actually needed to be used against Green Lanterns to restore power. Gardner found this out by accident when a member of the GLC fought him while he had absolutely no power. As the yellow ring of Sinestro spoke Sinestro's native language, Guy was entirely unable to communicate with the ring, although it seemed to understand him to a degree. He was to become Warrior. He served in Maxwell Lord's JLI until all Green Lantern rings lost their power when Hal Jordan (as Parallax) destroyed Oa. Finding himself powerless, he went on a quest for a mythical source of power deep in the jungle. This power source activated dormant extraterrestrial DNA in him, providing him with the ability to morph his body into various different forms -- mainly in the form of weapons. He then adopted the identity of Warrior. Gardner has since been purged of his extraterrestrial DNA and is currently a Green Lantern once more.
John Stewart is an architect who was Hal Jordan's backup after Gardner was seriously injured and served with the JLA on occasion. After Jordan gave up being Green Lantern in the 1980s, the Guardians called Stewart to full time duty as the sector's main Lantern. Stewart filled that role for some years, during which time he married Katma Tui, the Green Lantern of the planet Korugar. After Tui's murder, Stewart became the administrator of the "Mosaic World", a patchwork of communities from multiple planets that had been brought to Oa by an insane Guardian. From this position, Stewart eventually ascended to Guardianhood, which he later relinquished. During the collapse of the Corps he was a member of the Darkstars. After a brief period of paraplegia, he became Green Lantern once again and is currently a member of the latest incarnation of the JLA.
Sinestro was the Green Lantern from the planet Korugar (in Sector 1417); however, he believed that the best way to maintain order on Korugar was by using his ring to become the planet's dictator. The Guardians convicted him of criminal actions and banished him to the antimatter universe of Qward, where he was given a yellow power ring, and returned to our universe to become Hal Jordan's greatest enemy. He was apparently killed in action, helping defend the central power battery on Oa from the insane Jordan. However, he was recently seen during Green Lantern: Rebirth, where he revealed that he had somehow faked his death as part of a ploy to drive Hal Jordan mad. In a battle against Jordan, he fled to the Anti-Matter Universe.
Katma Tui led the Korugarian rebellion against Sinestro, and became his successor after the Guardians arrested him. She eventually married John Stewart and served with him in the Darkstars, but was later murdered by Star Sapphire.
Mogo is not only a Green Lantern, but is also an entire planet. Most notably featured in the Alan Moore story "Mogo Doesn't Socialize" from Green Lantern (2nd series) #188. Mogo itself is powered by Green Lantern energy and has control over its own surface and natural defenses. Mogo was also the site of the DC/Dark Horse Comics crossover miniseries Green Lantern Versus Aliens - the Green Lantern Corps during Jordan's time encountered the predatory creatures, and felt that Mogo was the best chance for containment.

Powers and abilities
All Green Lanterns wield a power ring that can generate a variety of effects and energy constructs, sustained purely by the ring wearer's strength of will. The greater the user's willpower, the more effective the ring is.

Power rings allow the user to fly and to cover themselves and others with a protective force field, suitable for travelling through outer space. They can also generate beams and solid structures of energy that can be moved simply by thinking about doing so, enabling the user to create cages, transportation platforms, walls, and battering rams. The ring can also be used to search for energy signatures or particular objects. It can serve as a universal translator. The ring can manipulate sub-atomic particles (effectively producing new elements) and split atoms, but those powers are rarely used by Green Lanterns.

The rings of the Green Lantern Corps appear to be semi-sentient computers, able to talk to and advise the user as to various courses of action.

Rings typically hold a limited charge. Alan Scott's ring and the Green Lantern Corps rings must be recharged every 24 hours. Kyle Rayner's ring also has limited energy, but no set time limit; the energy is expended by Rayner's use of the ring, so the duration of each charge is determined by his actions.

Alan Scott's ring cannot directly affect objects made of wood, and Green Lantern Corps rings cannot directly affect objects colored yellow. Originally it was believed that the Guardians wanted the rings to have a weakness to prevent a Green Lantern from becoming all powerful, although recent events have revealed that the yellow "impurity" was in fact a yellow-energy being of pure fear, trapped in the Central Power Battery. Lanterns have typically found ways to get around these limitations by affecting objects indirectly. For example, if the Lantern is faced with a yellow gas approaching him, a fan can be created to blow it away since the fan only directly affects the normal air around it, not the gas. Kyle Rayner's ring can affect both wooden and yellow objects, but his mind has proven to be susceptible to forms of external control (such as hallucinogens, psychic attacks, and other phenomena that disrupt his thought processes). Nowadays, a holder of a Corps ring can overcome the yellow weakness by recognizing the fear behind it, and facing that fear (Green Lantern (4th series) #1, July, 2005).

In addition, the effectiveness of a wielder's power ring can be adversely affected by a weakening of resolve and will. For example during the Millennium affair, Hal Jordan fought a Manhunter who psychologically attacked him in the battle to make him doubt that the people he was protecting valued the principles he was fighting for. Jordan's resolve began to weaken and his ring lost effectiveness until he was nearly defeated. However, one of his charges then struck the Manhunter declaring in so many words that she did deeply value Jordan's principles as well. With this dramatic affirmation, Jordan's faith in his cause was restored and the ring instantly returned to full power to defeat the Manhunter.

Green Lantern Corps rings typically reserve a small portion of their power for a passive force field that "protects the wielder from mortal harm". In dire emergency, that energy reserve can be tapped, at the expense of said protection, until it too is exhausted. Kyle Rayner's reconfigured ring can "run low", but never completely loses its charge; however, it doesn't shield him from harm if he's caught off-guard.

The GLC rings do not necessarily have to be worn to be wielded in some functions. For instance, Ch'p once faced a hostage situation where the villain demanded he take off his ring or the hostage would be harmed. Ch'p complied, but not before ordering the ring to fire a restraining beam on the villain seconds after being removed from physical contact (which was done, and the villain was captured). Rayner can will his ring to return to him if it is ever removed or lost.

Standard Green Lantern Corps and Alan Scott's rings can be used by anyone who wears them. Rayner's ring is keyed to his genetic pattern and is useless to anyone else (except for Hal Jordan, as shown in Green Lantern (3rd series) #99).


Television
Several Green Lanterns have appeared in animated TV shows, both as regular characters and as guest stars.


Regular roles

Green Lantern John Stewart in Justice LeagueHal Jordan was the featured character in a solo series which was part of The Aquaman/Superman Hour as well as part of the Justice League segment. In addition, the character was an occasional supporting character in the various Super Friends incarnations.

John Stewart is a member of the Justice League in the Justice League animated series. In this series, Stewart's ring was initially constrained to permitting him to fly, generating a protective force field, creating walls, and firing energy blasts; this limitation was established as being due to Stewart's mindset, not a inherent limitation of the ring itself. (The series' version of John Stewart is an ex-Marine, not an architect.) After being berated by Katma Tui for his unimaginative use of the ring, Stewart has increasingly generated complex tools (to defuse a bomb in one instance) and weapons. In a development not seen in any other version of the Green Lantern mythos, Stewart's eyes glow green as a side effect of the Ring's radiation (the glow fades when the ring runs out of power). In addition, the ring is effective against yellow; Stewart is seen fighting Sinestro in one episode and the yellow energy does not prove to be a significant problem for the Lantern.


Guest appearances
Kyle Rayner appeared as Green Lantern in one episode of Superman: The Animated Series. This incarnation appeared to be a hybrid of Kyle Rayner and Hal Jordan, since he was recruited by Abin Sur, fought Jordan's old enemy Sinestro, and looked more like Jordan than Rayner. This character was later inducted into the Green Lantern Corps. (In one scene, the name of test pilot Hal Jordan is clearly visible, painted on the nose of an airplane on the tarmac at a military base.)
Rayner was briefly mentioned in one episode of Justice League and reappeared after the series became Justice League Unlimited, bearing a far greater resemblance to his comics counterpart. Kilowog, Katma Tui, and Sinestro have also appeared in the series.
A character known as Green Guardsman (real name Scott Mason) appeared in a Justice League episode in which John Stewart and several other members traveled to a parallel universe. This other universe had its own superhero group, the Justice Guild, whose members were modeled on Golden Age versions of the Justice League characters. Green Guardsman was an homage to the Golden Age Green Lantern.
The Justice League version of John Stewart has appeared in a few episodes of Static Shock, both as a member of the League and in a solo appearance.
A two-part episode of Batman Beyond featured a future Justice League Unlimited that included a Green Lantern who was an eight-year old Asian child; he later reappeared as a young adult in the Justice League Unlimited episode Epilogue. (The character was created for this appearance, and has not appeared elsewhere.) His name was Kai-ro, a tribute to Green Lantern's alien sidekick on the SuperFriends, Cairo.
The John Stewart version from Justice League is also a fad on YTMND along with his quote "Transistors? They weren't invented until after the war!"
Hal Jordan appeared briefly in a two-part episode of Justice League Unlimited in which a time-traveling villain caused the timeline to become unstable, with characters changing or disappearing as their history was altered. At one point, John Stewart morphed into Jordan, who aided the other characters for several minutes before changing back into Stewart.

Trivia
The unsuccessful pilot for a live-action Justice League of America television series in 1997 included Matthew Settle as Guy Gardner, although the pilot's Green Lantern used only the name and costume of the comic-book Gardner. In personality and appearance, he more closely resembled Hal Jordan. He wore a mask similar to the one Kyle Rayner wore as a part of his original costume. His ring closely resembled that of Alan Scott. However, this ring didn't bestow the power of flight upon its wearer -- instead, Gardner flew by using the ring to generate a helicopter rotor.
The animated series Duck Dodgers has an episode in which a mixup at the dry cleaners results in Dodgers (AKA Daffy Duck) getting Hal Jordan's outfit -- and ring. The episode includes appearances by many well-known members of the Green Lantern Corps. Hal Jordan himself shows up at the episode's finale, voiced by film director Kevin Smith, a friend of producer Paul Dini, who co-wrote the episode.
The television series The Greatest American Hero has a premise that closely resembles the Silver Age Green Lantern in many respects.
Other DC Superheroes who have wielded the GL Ring and/or powers temporarily include Superman (Action 642), Nightwing (Action 642), Green Arrow (GL:Rebirth 4) and Zatanna (Green Lantern (v2) 42).
DC Superheroes who have filled the role in DC's Elseworlds include Clark Kent (Superman: Last Son of Earth), Bruce Wayne (In Darkest Knight), and Barbara Gordon (JLA: Created Equal)

Green Lantern oath
Green Lantern is famous for the oath he recites when he charges his ring. Originally, the oath was simple:

...and I shall shed my light over dark evil.
For the dark things cannot stand the light,
The light of the Green Lantern!
In the mid-1940s, this was revised by science fiction writer Alfred Bester into the form that became famous during the Hal Jordan era:

In brightest day, in blackest night
No evil shall escape my sight
Let those who worship evil's might
Beware my power, Green Lantern's light!
The word "blackest" is often replaced with "darkest" to avoid racist connotations.

It has since been established that each Green Lantern has his, her, or its own oath. Notable oaths include that of Jack T. Chance:

You who are wicked and evil and mean
I'm the nastiest bastard you EVER have seen!
Come one, come all, put up a fight
I'll whup your asses with Green Lantern's light!
and that of Rot Lop Fan, a Green Lantern whose species lacks sight, and thus has no concepts of brightness, day, darkness, night, color, light, or lanterns:

In loudest din or hush profound
My ears hear evil's slightest sound
Let those who toll out evil's knell
Beware my power, the F-Sharp Bell!