Commander Keen in Aliens Ate My Babysitter (stylized as Aliens Ate My Babysitter!) is a side-scrolling platform video game developed by id Software and published by FormGen in December 1991 for MS-DOS. It is the seventh episode of the Commander Keen series, though it is numbered as the sixth, as Commander Keen in Keen Dreams is outside of the main continuity. The game follows the titular Commander Keen, an eight-year-old child genius, as he journeys through an alien world to rescue his kidnapped babysitter. The game feature Keen running, jumping, and shooting through various levels while opposed by aliens, robots, and other hazards.