- 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
Stockwell started acting professionally during the mid-1940s. He is perhaps best-known for playing Rear Admiral Albert "Al" Calavicci in the NBC series with Bakula, though his comic turn in Married to the Mob is one of his best-nown film roles.
More recently Stockwell had a recurring multiplicitous role in Ronald D. Moore's Battlestar Galactica as one of the seven known human-like Cylon models — often seen several times in a shot at once.