By Simon Vozick-Levinson
Updated March 15, 2010 at 09:59 AM EDT

Battlestar Galactica alum James Callis has joined the cast of SyFy’s Eureka, according to the Hollywood Reporter. Callis is best known for playing Dr. Gaius Baltar on Battlestar Galactica. He will appear on Eureka‘s fourth season as “Dr. Grant, a former resident of the town whose return is cause for alarm.”