 The majority of his work has been in television, including his role as the primary villain Apophis in the first four seasons of "Stargate SG-1" (plus a few appearances thereafter).However, he has also appeared on the big screen in films such as "Catwoman" and "The Chronicles of Riddick".His brother Stephen is also in the entertainment business, and has directed several episodes of television shows including "Dark Angel", "Crossing Jordan" and "Lost".