 Warlock sends out his henchman while the benevolent Vampire and Monster (of Frankenstein), shrunken by an evil spell, are watching TV at the home of Jack, a lazy, girl-crazy teenager who has taken them in. The two must battle through the house outside on the streets, in the sewer, at a construction site, through a Chinese restaurant, and finally through monster mountain. Major foes include Spring-Heeled Jack, Bigfoot, Kraken, Gremlin, Medusa, and Warlock.