 Dee Dee is thrilled when her mother asks her to go into Dexter s room and check to make sure he s ready for school...because it means she can sneak into his secret lab and wreck everything in site. This time, Dee Dee gets her hands on Dexter s newest invention: a hand-held device that turns her and her brother into various animals (from a rabbit, to a frog, a hamster, a tiger, even a whale) as they try to hide what s going on from their mom and get ready for school at the same time.