- 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
The U.S.S. Essex's first officer in 2167. Mullen died when the Ux-Mal system criminals tried to use the Essex to escape their prison on a moon orbiting Mab-Bu VI.