Wolfenstein 3D is divided into two sets of three episodes: "Escape from Castle Wolfenstein", "Operation: Eisenfaust", and "Die, Führer, Die!" serve as the primary trilogy, with a second trilogy titled The Nocturnal Missions including "A Dark Secret", "Trail of the Madman", and "Confrontation". The protagonist is William "B.J." Blazkowicz, an American spy of Polish descent, and the game follows his efforts to destroy the Nazi regime. In "Escape", Blazkowicz has been captured while trying to find the plans for Operation Eisenfaust (Iron Fist) and imprisoned in Castle Wolfenstein, from which he must escape. "Operation: Eisenfaust" follows his discovery and thwarting of the Nazi plan to create an army of undead mutants in Castle Hollehammer, while in "Die, Führer, Die!" he infiltrates a bunker under the Reichstag, culminating in a battle with Adolf Hitler in a robotic suit equipped with four chain guns.
