A bad batch of mutated mushrooms sends our antiheroes on a white-knuckle trip down memory lane. Flashes of repressed recollections bubble to the surface of the Racers' fevered brains, and these tantalizing tidbits suggest a single point of origin: a high-tech facility from hell known as the Butcher Shop! Against the advice of the omnipresent Announcer, the Racers roar towards the facility. But will they find answers...or death?