James Nicholas Callis (born 4 June 1971) is an English actor. He is known for playing Dr. Gaius Baltar in the re-imagined Battlestar Galactica miniseries and television series, and Bridget Jones's best friend Tom in Bridget Jones's Diary, Bridget Jones: The Edge of Reason, and Bridget Jones's Baby. He joined the cast of the TV series Eureka, on...