When fourth-grader George starts at a new school, he vows to become a model student instead of the class clown he has always been, but just as his plan is going really well, he is overtaken by a magic burp that turns him back into a mischief-maker.

Fourth-grader George gets help from his friend Alex in trying to control the magic burps that take control and cause him to misbehave in funny ways, but when the class bully celebrates his birthday at a water park, anything can happen.

Katie and her third-grade class go on a field trip to the natural history museum where Katie finds herself magically transported into the body of their tour guide.

While her class is studying reptiles, Katie, a vegetarian, refuses to feed worms to Slinky the snake, class 4A's pet, but when the magic wind turns her into Slinky, Katie learns that some animals cannot survive on vegetables alone.

George's magic burps threaten to ruin not only his team's chances of winning a class field day, but also his audition to be the fourth-grade sports reporter for his school's new closed-circuit television station.

Katie's teacher, Mrs. Derkman, hopes to win the Teacher of the Year contest, but her chances do not look good when Katie turns into her teacher and cannot keep a class full of out-of-control third-graders in line.