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The Earth is under attack by vicious aliens that are intent on annihilating the planet…and all its inhabitants! There's only one man with the strength and courage to stand up to this threat and save the world from total destruction: Jon Steadman. You take the role of Steadman as you face off against some of the meanest and most cunning alien foes you've ever encountered. You're a one-man army up against alien maniacs, bikers, robots, and giant roaches. Luckily, you have a huge arsenal of weapons at your disposal, so you can launch cluster bombs, sonic blasts, and nuclear smart bombs on the aliens and watch them fry! While you'll have your hands full with the army of aliens, your primary objective is to disarm the Doomsday Bomb and rescue the human hostages. If you don't think you can handle it by yourself, team up with a friend and take on the enemy together.
This is an arcade-style shooter. You shoot from first person perspective at enemies that keep appearing on the screen. Once you have eliminated enough enemies, you are automatically transferred to the next fixed screen. On your way, you can pick special items that allow you to use a powerful all-screen attack a limited amount of times.