Ralf Rudolf Moeller (born 12 January 1959) is a German actor and former competitive bodybuilder. He is known for his roles of Brick Bardo in Cyborg, Kjartan in The Viking Sagas, the title character in the television show Conan the Adventurer, Hagen in Gladiator, Thorak in The Scorpion King, and Ulfar in Pathfinder.