Junie B is very upset when a boy in her class plans to invite everyone except her to his birthday party, but her grandfather helps her deal with the situation.
Excitable Junie B. Jones manages to find trouble both before and during a trip to Hawaii and records each incident in a photo journal given to her by her teacher.
Through a misunderstanding, Junie B. thinks that her new baby brother is really a baby monkey, and her report of this news creates excitement and trouble in her kindergarten class.
After the principal of P.S. 88 is turned into a frog by a bumbling magician, the frog bargains for the chance to act as principal until Mr. Bundy returns from his "family emergency."