Sam and Hammie Rex discover a terrifying giant squirrel hiding in the woods behind Horace Hotwater Middle School. But nobody else believes Squirrel Kong is real. Then Hammie Rex takes the blame for Squirrel Kong's destructive rampages, and the principal threatens to send him away to home for dangerous, troubled small pets. To save his hamster friend, can Sam prove that Squirrel Kong is the true menace?