- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
Region of nitrium-rich asteroids and the home of metal parasites that feed on them; at least one asteroid winds up in the Tessen system, where its destruction wreaks the parasites loose on the U.S.S. Enterprise NCC-1701-D.