With the academy in crisis -- and her friends trapped in a deep freeze -- Mildred considers a selfless sacrifice to save the day.

The girls ask their ancestors for help reigniting the Founding Stone. Meanwhile, at the school Halloween party, magic's misfiring in every direction.

Mildred meddles in Miss Bat and Mr Rowan-Webb’s relationship.

Miss Pentangle teaches modern witching workshops.

Miss Cackle goes to find out her fate at the Magic Council.

Mildred and Enid try to help Maud but accidentally turn her into a baby.

Mildred can't understand why the girls are so scared of collecting potions ingredients in the woods until she comes face to face with an unusual creature.

Enid takes a practical joke too far and is threatened with expulsion. Mildred turns herself into a bat but can’t remember how to turn herself back. Clarice struggles to understand the appeal of practical jokes.

A lesson on family trees gets Mildred thinking about finding her dad. Ethel can’t resist making a cruel joke at Mildred’s expense. Sports Day pushes Maud to take desperate measures.

Miss Mould helps Mildred with her magic, and Beatrice reveals the source of her sneezing. A famed chantress's biggest fan has an even bigger secret.

Ethel’s clone spell spirals out of control.

Mildred and Ethel are more at odds than ever, so Miss Cackle sets a friendship trap on them, pushing them too close for comfort.

It's the first day of term and Mildred stumbles upon something very important.