- 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
Vulcan male and T'Pol's fiancee. Koss was an architect, and was betrothed to T'Pol during childhood. Before T'Pol was assigned to the Enterprise NX-01, she and Koss had met only four times. Because marrying Koss would have forced T'Pol to leave her post, she broke the engagement.