The commercial version of Duke Nukem 3D contains several pieces of data that are unused in the game, such as sprites and bits of code.
Alien Queen Sentry
Main Article: Alien Queen Sentry
There is unused data in the Duke Nukem 3D: Atomic Edition game files for an enemy that would have bore the same relationship to the Alien Queen that the Battlelord Sentry bears to the Battlelord. In Duke Nukem 3D: 20th Anniversary World Tour, the enemy's code was updated but still does not appear anywhere in the game. This makes it the only enemy to have been twice created and scrapped in the game's development history.
Main Article: Scorpion Tank
The game contains unused sprites of an enemy resembling the Pig Cop Tank but shaped like a scorpion. The enemy has been dubbed the "Scorpion Tank" by fans.
Enemy top views
There are a few sprites that show several early enemies as seen from above. These presumably would have been displayed in the Map View, but the idea was scrapped.