Hamstersaurus Rex gets crushed

"Sam Gibbs and his super-strong tiny buddy, Hamstersaurus Rex, keep encountering creepy abnormal objects at their school, like a floating sports jersey and a runaway go-kart. Sam doesn't believe in ghosts, but he has to admit that the hauntings are getting weirder . . . and more dangerous. Could bizarre mutant animals be the cause? At Horace Hotwater, they often are."--Provided by publisher.