Eight-year-old Mia Macarooney is delighted to learn she is from a family of superheroes, but her acceptance into the Program for In Training Superheroes requires she take a placement exam.

Mia brings her cat, Chaos Macarooney, to PITS Day, and must keep the peace between Chaos and Hugo Fast's cat, Mr. Whiskers, before total chaos breaks out.

"Mia finds out that her regular school will be putting on a play about superheroes. As soon as the casting call goes out, Mia's sure that the main character role was made just for her. Because after all, who better to play the part than a real-life superhero? But when show day comes around and nerves are running high, will Mia be able to take the stage and be herself without revealing her super-secret?"--

Mia Mayhem learns some important things about herself and her abilities during a family vacation to the beach.

After a weird storm, Mia's superpowers are transferred to her best friend, Eddie, and she gets to train him to use them at her secret school.

Mia is excited about her first super-speed training class, but a bully on her relay team leads her to lose her shadow and, worse, to snap at her friends.