- 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
Female from Sargon's planet whose consciousness survived 500,000 years in a receptacle. To prevent harming others with her god-like powers, Thalassa joined her husband, Sargon, in the great void.