Alien3 is a 1992 side-scrolling shooter video game developed by Probe Software and published by Arena Entertainment for the SEGA Master System, SEGA Genesis/Mega Drive and Commodore 64. It is based on the film of the same name. Ports for the Amiga home computer and Nintendo Entertainment System were published by Virgin Games and LJN, respectively, while a version for the SEGA Game Gear was released in 1994 by Arena Entertainment.