He reprised the role in 2004’s “Bridget Jones: The Edge of Reason”. Callis landed one of his best-known parts, playing Dr. Gaius Baltar, in “Battlestar Galactica”. He appeared in 73 episodes of the show from 2004 until 2010, including the 2007 TV movie “Battlestar Galactica: Razor”. Callis won the Saturn Award for Best Supporting Actor for the part. He has since had roles in “One Night with the King”, “Merlin and the Book of the Beasts”, “Austenland”, “Numb3rs”, “FlashForward”, “Merlin”, “Midsomer Murders”, “Eureka”, “Key and Peele”, “CSI: Crime Scene Investigation”, and “The Musketeers”.