Shape-shifting aliens have infiltrated the city, creating chaos and panic! Fortunately, a trio of heroes called the Alien Busters have agreed to wipe out the invading creatures! Each member of the team wields their own special attacks to unload a world of hurt on the Martian menaces, from the city streets to the mothership.
Gordon, a tough guy with a bazooka, has a special gunship attack, while Karla has a flamethrower for alien crisping - though she prefers to use her special ballistic missile attack. Finally, Slammer the robot can self-destruct at will and attacks the invaders with an electric whip, as well as other devices. Take the aliens by storm and save your city!