Gamora is not an alias, but her real name.

Gamora is the sole survivor of the alien humanoid race called the Zen Whoberi, who refused to convert to the doctrines of the Universal Church of Truth (a star-spanning religious empire). Agents of the Church exterminated the peaceful people for their resistance. The mad Titan named Thanos rescued the infant Gamora to train her to assassinate the Magus, the leader (and object of worship) of the Universal Church of Truth. After failing an assassination attempt at the last second, she realised that Thanos wanted to destroy all life in the universe. After Thanos was hindered to do so, Gamora settled on the world Godthab Omega as the leader of a group of female warriors called the Graces.

Gamora received treatments from Thanos that enhanced her speed, strength, stamina and agility. She was as well cybernetically enhanced to have superhuman strength, speed and an accelerated healing rate. Additionally, she was trained in stealth techniques and is one of the most skilled martial artists in the universe.