Mildred returns to Ms. Cackle's academy with the hopes of a better year; but when her summer holiday project is stolen she has to prove she didn't make it up. Meanwhile, a group of first years discover a secret in a tree. Plus a discovery in the school's ruins spells hope and trouble for everyone.

Tired of their constant bickering, Ms. Cackle places a friendship trap on Mildred and Ethel. As the girls most solve the trap, Izzy and the rest of the first years most solve another problem of their own. Plus the arrival of a new teacher ruffles Ms. Hardbrooms feathers.

In order to show she's still the best; Ethel Conjures up a cloning potion only to have a playful version of herself come out and stir trouble. Meanwhile, the arrival of the school's magical counsel head has Ms. Cackle and Hardbroom scrambling to find the Foundation stone.

When a young wizard wants to learn chanting, Mildred and her friends sneak him in to meet a famous Chanter at the school. But there's one small hiccup. He's the grandson of the High Wizard. Meanwhile, the first years try to banish a problem, only to create a new one.

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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

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Mildred Hubble lives an ordinary life with her mum Julie, until the day that Maud Spellbody crashes her broomstick into their balcony and nothing is ever the same again. Maud introduces Mildred to Cackle's Academy - a school for young witches set high on a mountaintop. Under the watchful eye of friendly headmistress Miss Cackle and scary deputy Miss Hardbroom, Mildred begins her training, but no matter how hard she tries, her spells have a habit of going badly wrong, causing chaos. Will Mildred always be The Worst Witch..?