Alien Carnage, also known as Halloween Harry, is a sidescrolling action platform game. The story is that the earth is being taken over by aliens and the alien leader tells the goverment that if they do not surrender the planet in 24 hours, innocent civilians will be taken hostage and turned into zombies to help take over the planet. Harry is called upon to help save the people held captive by the aliens and to destroy the alien menace.