10 Actors You Didn't Know Were In Star Trek Twice
8. Judson Scott
Judson Scott was only under heavy prosthetics once in Star Trek, when he played the Romulan Commander Rekar in Voyager. However, even if you did see his name on the credits for the Voyager episode Message in a Bottle, you may not immediately put two and two together and realise it's the same actor who played one of Khan Noonien-Singh's acolytes.
Scott is quite prominent in Star Trek II: The Wrath of Khan, regularly seen by Khan's side as he wages revenge against James T Kirk. However, Judson Scott wasn't actually credited on-screen for his role in the movie. This was due to a failure by his agent to negotiate a more prominent position for the actor's name on the end credits.
The agent refused to accept a lower billing for Judson Scott, and waived the right to be billed. This meant that Scott's role as Joachim in The Wrath of Khan remained uncredited. Six years later, Scott got a credit on Star Trek when he appeared in the Next Generation as Sobi in the episode Symbiosis. While he was visibly recognisable in that episode, the name on the credits wouldn't have been.