Return to Castle Wolfenstein

In Return to Castle Wolfenstein, series' hero and special agent B. J. Blazkowicz must thwart the Nazi's attempts at occult rituals and twisted science. Infiltrating castle strongholds, villages, secret bases, laboratories, and ancient crypts and churches, his mission has him face off against undead warriors, cyborg monsters, and the officers and rank-and-file of the Third Reich. 

The game includes both a single-player campaign spanning more than 20 levels and a team-based multiplayer mode. Though initially released for PC, Return to Castle Wolfenstein was later ported to the Xbox and PlayStation 2. There is a Mac version as well.

Developer Quote
World War II rages and nations fall. SS head Himmler has Hitler's full backing to twist science and the occult into an army capable of annihilating the Allies once and for all. Battling alone, you're on an intense mission to pierce the black heart of the Third Reich and stop Himmler -- or die trying. Fighting in advanced team-based multiplayer mode, you'll wage your own WWII in an all-out Axis vs. Allies contest for frontline domination.