George and Harold need good grades for their parents to let them go to Lake Summer Camp, but the Melvins intend to keep Melvin as the top student, and use animal training as a test. When George and Harold miss their rat's point of the comic he drew, the mutagen Melvin made turns him into a revenge-obsessed monster. With the Chupacabra arriving in Piqua to have revenge on Mr. Meaner, a race against time is up to make a new couple
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