After Justin starts his Monster Hunting course, he detects three unregistered "level six" monsters on Waverly Place. He reports them to the , completely forgetting that Juliet van Heusen and her vampire parents live right there at the Late Night Bite.

To save Juliet from being captured, the Russo siblings scramble to find "replacement" monsters to trick the professional hunters:

Selena Gomez (Alex), David Henrie (Justin), Jake T. Austin (Max)