Star Trek: The Rebel Universe

Star Trek: The Rebel Universe is an action-adventure computer game published by Firebird Software in Europe and Simon & Schuster Interactive in America. It was originally released for the Atari ST in 1987, and was followed the next year with versions for the Commodore 64 and IBM PC. The game places the user in control of the bridge crew of the Enterprise while they explore an area of space attempting to understand why all previous Federation ships that entered the region have mutinied. They have five years to complete their mission, after which the entire area will be sealed off with the Enterprise trapped inside. Each member of the bridge crew is in control of certain aspects of ship operations, allowing the player to control the mission through their stations. The user can also orbit above planets and beam down selected members in order to find devices or clues that can solve the mystery of the 'Quarantine Zone'.

Starfleet is currently puzzled by a mysterious region of space. Virtually every Federation starship that enters it defects to the Klingon Empire. Designating this region of space the Quarantine Zone, Starfleet sees no other option but to seal it off with a 'Klein Sphere,' a massive force field. Before the Klein Sphere is activated, Starfleet sends in the U.S.S. Enterprise to investigate.

The Enterprise soon discovers the source of the defections. The Klingons have discovered a rare isotope of dilithium crystals called 'Dilithium Delta 6,' which has unusual psionic properties. The Klingons have been giving out Dilithium Delta 6 to starship captains as a peace offering. Once the Dilithium Delta 6 is installed in a starship, the crew becomes susceptible to mind control. Coupled with a network of 'psi-beam emitters' to ensure the effects of the Dilithium Delta 6 remain permanent, the Federation starships are compelled to obey their new Klingon masters.

The Enterprise crew devises several plans to free their fellow Federation starships and stop the Klingons: