- 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
Human male serving as Ambassador Sarek's chief-of-staff in 2366. At the time of Sarek's visit to the U.S.S. Enterprise NCC-1701-D, Mendrossen knew Sarek's health was failing and tried to conceal it.