James Callis as Athan

James Callis guest stars in Season 3, as the son of Cassandra and James Cole, born out of time.

Best known to sci-fi fans as Gaius Baltar in Battlestar Galactica, James Callis is an English actor who attended the University of York, graduating in 1993 with a BA in English and Related Literature. Callis has appeared in various West End productions and television series as well as on radio. He has also been involved in writing and directing.

He is best known for playing Dr. Gaius Baltar in the re-imagined Battlestar Galactica miniseries and television series, and Bridget Jones’ best friend in Bridget Jones’s Diary and Bridget Jones: The Edge of Reason. He later reprised the role in 2016, in Bridget Jones’s Baby. He joined the cast of the TV Series Eureka, on Syfy, in 2010. In 2017 he voiced the character Alucard on the Netflix series Castlevania, based on the video game of the same name.

ew.com report 12 Monkeys adds Battlestar Galactica’s James Callis in season 3
syfywire: BSG alum James Callis cast in pivotal 12 Moneys Season 3 role