One day, Jason's pet frog ran away and headed for the swamp. Jason chased after him, until the frog leaped onto some radioactive fluid. The frog began to grow before Jason's eyes, and eventually fell through the earth. Jason jumped in after his frog, only to find an enormous tank. He decided to use the tank in order to get his frog back.
There are eight levels to play, driving around in the tank or walking on foot. Jason is eqiupped with a gun, and can find various different bullets around the land.