- 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
Starfleet officer who renounced his Federation citizenship and gave his allegiance to the Romulan Empire in 2349. DeSeve found the Romulan system of absolute values and strong sense of purpose to be appealing, but he later came to realize that right and wrong isn't always so black-and-white. After living on Romulus for 20 years, he became disillusioned by Romulan society and their ethics, and surrendered to the Federation in 2369 to aid the defection of Romulan Vice-Proconsul M'ret.