10 Actors Who Appeared In Star Trek AND Battlestar Galactica

2. Dean Stockwell

The late, great Dean Stockwell was an Academy Award-nominated, Golden Globe-winning, acting and sci-fi legend. Stockwell's film and TV credits stretch all the way to Caprica and/or Tandar Prime, but most will remember him as Rear Admiral Albert 'Al' Calavicci, holographic sidekick to Scott Bakula's Doctor Samuel Beckett.

Bakula and Stockwell would act alongside each other once more in the Star Trek: Enterprise episode Detained. In it, Stockwell played the decidedly more antagonistic Colonel Grat, jailor of Suliban, and of Captain Archer. In a behind-the-scenes interview at the time for Extra, via TrekCore, Bakula called the reunion, "the greatest thing ever". Stockwell admitted, jokingly, to being a little confused by the dialogue. "I don't know what a Tandaran, Suliban, Cabal, boogie-boogie booty is. […] I'm just in the dark," he added.

Stockwell brought that fine, dry sense of humour to his character in Battlestar Galactica. There, he was the altogether dastardly, but perceptively funny, humanoid Cylon model Number One, known also as John Cavil and Brother Cavil. Cavil/Number One first appeared in the season two episode Lay Down Your Burdens, Part I. He would play a pivotal role in the shape of things to come. "Well, this is an awkward moment."