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

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

Ethel’s clone spell spirals out of control.

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.

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.

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.

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

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

Miss Pentangle teaches modern witching workshops.

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

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

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