Second-grade graduate A.J. and his family rent a beach house, but summer vacation is ruined when annoying Andrea shows up and develops a crush on the lifeguard.
When Mr. Granite falls ill, A.J. and the gang endure a wacky week with a perpetually cheerful substitute teacher who wears a clown costume, uses hand puppets to talk, and uses magic tricks to saw students in half and make them disappear.