- 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
A highly unstable substance not carried onboard Federation vessels, but the only known substance capable of neutralizing poisonous tricyanate.
The hytritium in pure form had to be shuttled from ship to ship because of its instability for transporters.