- 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
Nerve gas used by the Klingons. Lethal in its pure state, in 2268 Dr. McCoy used a diluted theragen and alcohol combination to deaden nerve input to the brain and help the crew of the U.S.S. Enterprise NCC-1701 survive exposure to spatial interphase.