"Duke Nukem II is an MS-DOS platform game developed by Apogee Software and released December 3, 1993. The game consists of four episodes (of 8 levels each), the first available as shareware.
The evil Rigelatins plan to enslave earth, and they kidnap Duke Nukem (who was performing in an interview about his new autobiography Why I'm So Great), to use his brain to plot the attack for their forces. Duke breaks free to save the world, again."
Source: Wikipedia, "Duke_Nukem_II," available under the CC-BY-SA License.