In Return to Castle Wolfenstein, players take on the role of B.J. Blazkowicz, a highly decorated Army Ranger recruited into the Office of Secret Actions who must escape from and then return to Castle Wolfenstein in order to thwart Heinrich Himmler's plans for an unstoppable army raised through genetic engineering and harnessing occult powers. As Blazkowicz discovers more about Himmler's evil schemes, it is up to him to defeat them before they can level the Allies once and for all.