- 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 slightly radioactive hydrogen isotope with an atomic weight of 3, hazardous if in high concentrations. Tritium gas was used on Deep Space Nine in 2369 to track particle flow back to a dangerous graviton field buildup on the station.