Alien Storm

Alien Storm エイリアンストーム is a 1990 beat 'em up/shooter arcade game by Sega. It was later ported to the Sega Mega Drive/Genesis and Master System. The Sega Mega Drive version was also released on Wii's Virtual Console in 2007. The game appeared in Sega Mega Drive Ultimate Collection for Xbox 360 and PlayStation 3.

Plot
A homicidal alien race is invading Earth, and the only thing that stands between them and world domination are a special forces team known as the "Alien Busters", composed of Karen (absent in the Master System version, named "Karla" in some versions), Garth (named "Gordon" in some versions) and Scooter (the robot, named "Slammer" in Master System and PAL versions).