Duke Nukem, the politically incorrect celebrity and ultimate alien ass kicker, defends Earth and its babes from alien invasion. Take the fight to the aliens in Hollywood, Los Angeles, a moon base and alien spacecraft. Defeat the aliens, so Duke can get back to some R&R with a stogie, a warm belly and a bottle of Jack.
Map for Duke Nukem 3D (1.5 Atomic and eduke32 are recommended). Here is moon base with monsters. They dream to make you roastduke.