This version of the game took players through various maps based in Europe and North Africa, and allowed gamers to specialize in classes like 'Soldier,' 'Medic' and 'Engineer.' These modes were expanded on in 2003's 'Wolfenstein: Enemy Territory,' which was a free, open source and multiplayer-only spin-off. 'Return' was also the first multiplayer game in the series, featuring competitive modes that split players between the Axis and Allies. This game introduced Wilhem 'Deathshead' Strasse, a key franchise villain who played a major role in conducting the Nazis' monstrous experiments. Once again, you followed Blazkowicz through his journey to escape Castle Wolfenstein, except this time he's up against an SS division that's been bringing soldiers back from the dead. 'Return' was the first game in the franchise to tout true 3D graphics, taking advantage of the improved tech available at the time.