Duke Nukem is back. After defeating Dr. Proton's plan to take over the world, Duke is regarded as a hero, and, doing what any hero might, he writes a book. The humble tome, titled "Why I'm So Great" is an instant hit with the masses. Duke embarks on a promotional tour for the book, and that's when trouble starts. While smiling for the cameras and signing copies of his book in Neo Los Angeles, Duke is kidnapped by the Rigelatins, an evil alien race that wants to use Duke's brain patterns to power up their Think-O-Matic war computer and take control of the planet. Can Duke escape the alien ship and save the world once again? That's up to you in this action-packed, side-scrolling game with improved graphics, controls, and sound effects.