- 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
Planet: Excalbia. Sentient rock creatures whose planet is normally a bed of molten lava and deadly to humans. The Excalbians are capable of shape-shifting, and use this ability to experiment on the social practices and belief systems of passing alien life-forms.