Big Secret!

Summary- Harriet's parents have been looking for a cure for her diabetes, dragging her to doctor from doctor (including a holistic doctor) which makes Harriet unhappy.
Harriet talks to Poison Ivy (Polly Ivy's mother) who helps her schedule an appointment with a sensible doctor who convince her parents to lay off the search for a miracle.

In the end, Mr. & Mrs. Quinn agree to include their daughter in any decisions about her health care.

Meanwhile, Harriet makes up with her best friend, Ben, whom she had been fighting with since she was diagnosed with diabetes.

Subplot
The Hero High Students face competition from a rival babysitting service called Super Prep which includes younger Heroes.

The Class later loses cilents to the new superheroes, so they decided to recruit new classmates who turn out to be spies from Super Prep. They are eventually fired after failing to show up for their assigned sitting jobs.

The Children later learn from the others they sit for their sitters are unreliable. Attie reveals that one of her helpsters from the Prep School brought her boyfriend over and burned a hole in a chair with a cigarette while Polly Ivy says that her classmates ignore her (such as Attie).

After the girls find Attie outside in the cold weather without a hat or mittens, they tell the Atom who is upset & decides to call the other Parents to let them know.

In the end, the Kids settle the score with the Other Class who eventually closes their School.

Other Subplots
Polly Ivy struggles socially at sleeping and ends up sleeping and standing up in her Locker.

The Atom welcomes a new baby into his family named Ata.