John, a crypt guard, is investigating a flashing green light coming from one of the crypts. When he opens the door, a green vortex sucks him inside. He awakens in the crypt but notices something is different. When a rotting undead creature touches his shoulder, John realizes he has been transported to a different time and place. The undead creature reveals they are in the year 3000 and John must go on a quest to defeat the antagonist Wishi. Along the way, John acquires weapons and battles various undead minions. After making his way through a tower while fighting off more minions, John finally reaches the top to face Wishi in the final battle.