Khaj'Buur is a psionic Alien entity who spent an unknown amount of time trapped within the Nexus. When he defied his rulers, they imprisoned him within the Nexus.
- “Beyond the Nexus”: When the player and Captain Geordi La Forge encounter Khaj'Buur, he has controlled the minds of the crew of the U.S.S. Forrestal, and used them to attack the U.S.S. Madison in an effort to escape the Nexus. They attack and defeat him on the Madison's bridge, but he escapes to the Forrestal. After a ship-to-ship battle, Khaj'Buur surrenders and agrees to be taken into custody.