- 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
Federation scientist, prone to moments of confusion, who once gave a hypnotic lecture on the ionization effect of warp nacelles, then realized his topic was supposed to have been psychology. He had also carried out research into warp field technology, and taught temporal mechanics at Starfleet Academy, a course failed by Chakotay.