The player controls Keith Courage. Struck by a giant meteor, the world, in the game, has been invaded by creatures from another planet. Burrowing deep within the Earth's surface, the planet of B.A.D. (Beastly Alien Dudes) seeks to take over the world. As a member of N.I.C.E. (Nations of International Citizens for Earth), Keith's mission is to defeat B.A.D. and bring peace to the world. Armed with a sword, Keith must first defeat the outpost guards. Then, enter the Underworld. Here Keith activates the awesome Nova Suit. A secret force left to him by his fallen father, he is half man, half mechanical monster. Nearly invincible, his sword cracks with the power of lightning, as you wreak havoc on the fearsome Dudes. His goal is to reach the Robo Zone (the seventh Alpha Zone), headquarters of B.A.D. Succeed here and the player will win the game, recapturing the Earth and restoring humanity's place in the universe. Four friends offer Keith advice, swords, bombs, and extra lives. The player's goal is to collect the stolen riches left behind by the invaders and buy your way out of trouble with money.