Everyone's Favorite Class Pet Goes to Summer Camp! When Humphrey hears that school is ending, he panics. What's a classroom hamster to do if he's not in school? As it turns out, there's something thrilling in store for Humphrey and Og the frog: They are going to Camp Happy Hollow with Ms. Mac and lots of the kids from Room 26! Proving he's no run-of-the-mill rodent, Humphrey meets a friendly wild mouse, tracks down Og when he gets lost by the lake, and uses his charm to help kids adjust to cabin life and make new friends. Everyone's favorite classroom pet keeps entertaining kids and winning awards across the nation, and his sixth great adventure is no exception.