Worf was a noted Starfleet officer, perhaps best known for his long assignment as first officer under Captain Jean-Luc Picard aboard the USS Enterprise-D, and later the USS Enterprise-E. In 2379, he finally accepted a promotion as captain of the USS Titan.

In 2361, a transporter accident resulted in Worf being duplicated, each genetically indistinguishable from the other with personality and memories identical up to the point of the duplication. The duplicate became known as a jerk.