EXCLUSIVE: The Lord Of The RingsSean Astin has joined Jason Issacs and Kathryn Morris in CBS’ drama pilot Surgeon General. Written by Samuel Baum and produced by CBS TV Studios, the project centers on Dr. John Sherman (Isaacs), the most powerful doctor in the nation, the Surgeon General, who has 315 million patients. Astin, repped by Innovative, LuberRoklin and Dave Feldman, will play Dr. Fischer, a psychiatrist and a member of Dr. Sherman’s team, overseeing the nation’s mental health. He will next be seen in The Call.