- 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
Valakian elder. Esaak was concerned about an epidemic killing his people. Dr. Phlox discovered that it was actually a genetic mutation, but Captain Archer refused to provide the warp technology Esaak wanted, lest it interfere with the natural evolution of the Valakian people.