- 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
Gray-haired Klingon ambassador unmasked, in 2367, as a Romulan collaborator intent on dissolving the Klingon/Federation alliance by mind-controlling Geordi La Forge into killing a Klingon governor. Kell was arrested by the Klingons.