The Robot is a scrapped Duke Nukem Forever enemy.
The Robot is a large, bipedal robot with a minigun attached to its left side. Its front is designed to look like an evil face, with the red marks on its upper side representing eyes and its crotch representing an angry grimace.
The Robot appears to have scrapped as early as the 1998 trailer. It is unknown if the Robot ever managed to get into a functioning version of the game, as its only appearance is from the Quake 1 engine mockups.