- 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
Lorillian children are born able to breathe only this particular gas. There is not enough methyloxide in certain atmospheres where Lorillians live (Rigel X, for example), so Lorillian mothers wean their children to other natural elemental vapors by age four.