A hostile alien race has conquered the earth and enslaved the human race to do their bidding. The player assumes the role of a man who has worked in an alien maintenance garage. You steal a prototype alien combat vehicle called the MASTER and escape with it. You must use the MASTER to fight the alien forces in a desperate bid to save the planet.

A hostile alien race has conquered the earth and enslaved the human race to do their bidding. The player assumes the role of a man who has worked in an alien maintenance garage. You steal a prototype alien combat vehicle called the MASTER and escape with it. You must use the MASTER to fight the alien forces in a desperate bid to save the planet.