- 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
Steth was a lifeform encountered by the Voyager crew in 2374. Steth could take the form of anyone he encountered. and force the copied individual into the shape Steth was discarding.