Take aim on the Third Reich in blistering first-person shooter gameplay. You are a highly decorated Army Ranger recruited into the Office of Secret Actions (OSA) tasked with escaping and then returning to Castle Wolfenstein in an attempt to thwart Heinrich Himmler's occult and genetic experiments. Himmler believes himself to be a reincarnation of a 10th century dark prince, Henry the Fowler, also known as Heinrich. Through genetic engineering and the harnessing of occult powers, Himmler hopes to raise an unstoppable army to level the Allies once and for all.