Mildred and her friends try to join Ethel's Cauldron Club, but Mildred fails the initiation test after interference from Ethel. Luckily for Mildred, Fenella & Griselda, come to the rescue and create the Dangerous Old Books Society! Soon the stuffy old club begins to lose its luster & it's members! Meanwhile Miss Drill contemplates quitting after growing tired of Miss Hardbroom's harassment.

Miss Cackle's young niece, Gabrielle Gribble, comes to the Academy for teaching practice. Suffering from a bit of stage fright, Gabrielle takes Miss. Hardbroom's advice of being tough a little to0 seriously & she becomes a tyrant who throws the entire class in detention within minutes of her first day. Soon Mildred & her friends end up teaching her far more than she ever learned in College.

Love is in the air, or at least Miss Crotchet thinks it is. The visiting Professor Von Raffenberg seems to be smitten with her, but it turns out he is a conman, who is looking for the Lost Chord, which will grant the owner perfect luck! Some of the girls can see right through him, while others are conned into helping him.

Mildred & the other girls notice Miss Drill is down in the dumps. They decide to give her a potion which will allow the non-magical Miss Drill to temporarily gain magical powers! Now the other teachers are trying to help Miss Drill hone her powers, while the suspicious Ethel & Drusilla try to prove that Mildred & her friends are behind it all!

Miss Hecketty Broomhead returns to Cackle's Academy to take over while Miss Cackle goes to look after her sick aunt. She takes an instant dislike to Mildred & even forces her to wear a tracking bracelet at all times! Meanwhile her insistence on rigid time-keeping proves to be quite the problem, especially when she is considered to be a permanent replacement for Miss Cackle!

It's time for the dreaded Third Year Witch Project where nerves are frayed & unlikely partnerships forged! The girl's projects range from the typical of a retrieval spell, to the unique of a mini broom to the downright odd of chewing gum that never loses its flavor! The final demonstration in the Great Hall nearly ends in disaster, but all the girls work together to make the day memorable.

Mildred, Maud, Ethel & Drusilla are sent on work experience to Mrs Cosie's Cafe & learn all there is about running a restaurant. That is until Ethel changes the Cafe to be the way she likes it. Ethel claims its just for fun, but when a group of tourists & Grand Wizard Hellibore all arrive at the same time the girls must find a way to get out of the mess!

Mildred's potion exam, & gardening competition are both happening at the same time! Her chances of passing look slim, as Ethel and Drusilla conspire to get her thrown out of Cackle's. When Mr. Blossom's greenhouse is trashed, Miss Hardbroom suspects Mildred, & forbids her from participating further.

The girls are restless, & they can't wait for the term to end. Miss Drill introduces the girls to basketball and arranges a friendly match with the Hevversham Hevvies! The Hevvies are ruthless & walk all over the girls. Mildred is hopeless and has a tendency to freeze when it's time to shoot at the basket! The entire school is watching, which doesn't make it any easier for her!

Frank's nephew Charlie has arrived for a visit to Cackles. He's fed up with his own school and jealous of the fun the girls seem to have at the Academy, so he persuades his uncle to ask if he can become a pupil at the Academy. Miss Drill seems sympathetic to the request but Miss Hardbroom is dead set against it. Leaving Miss Cackle wondering if it might not be time for the Academy to go coed.

Ethel thinks it's Mildred's fault that Sybil is always following her around, so when things go too far during a lesson of broomstick flying, Ethel vows to get her back, by turning her into a frog! With the help of a wizard who has also been turned into a frog, Mildred just might turn back & figure out who did this to her!

Chief Wizard Hellibore is to give a master class in magic to the girls of Cackle's Academy. This is an ideal opportunity for Mildred to enlist his help to change her newfound frog friend back to his old self. Unfortunately, Mildred has been banished to her room and, as punishment, forbidden to attend the master class!

A summer heatwave has hit Cackle's & the girls are succumbing to the heat. Miss Cackle produces a magical soda, that is so refreshing it's all the girls can think about. Soon wanting more, Miss Cackle decides to have a contest to see who can make the best non magical soda. However Ethel decides performing a little bit of magic is worth beating Mildred.

The first years are left with Miss Bat and Miss Drill while the rest of the school is away on a trip. The two teachers see this as an opportunity to put all their favorite educational ideas into practice. As a result, there's a lot of P.E. and chanting for the girls. In the staff room, Miss Drill and Miss Bat are competing for Miss Cackle's vacant chair and the authority it confirms.

As their third year grows to a close the girls sneak out to attend a local Fair. When Miss Cackle discovers them, she hears Mildred mocking her, the usually kind Miss Cackle punishes the whole school! Feeling this is unfair Mildred & Jadu decide to create a newspaper that mocks the teachers & has a list of their demands for how the school should be ran! Once discovered the two face expulsion!

Mildred & her friends set off to visit Algernon at his riverside retreat. Mildred has been told to leave her cat behind, but when no one is looking she manages to sneak him in, hiding him on a boat. Meanwhile, Ethel and Drusilla discover the boat with Tabby & they untie the boat sending it down the river towards the rapids, completely unaware that Miss Hardbroom is also on board!

The girls of Cackle's Academy make a good will trip to the all boy's Camelot College. Unfortunately the boys they're visiting are not exactly rolling out the red carpet for Mildred & the others! Even worse is there is rumor of a merger between the two schools, but Mildred and her friends devise a plan which is guaranteed to make Miss Cackle change her mind.

Chief Wizard, Egbert Hellibore & his three apprentice Wizards pay a visit to Cackle's Academy. The girls soon see how mischievous & underhanded the boys are & a prank war begins, with Mildred being blamed for it! Soon there will be a debate between the boys and the girls & Mildred finds the boys are using magical trickery to cheat! Now she plans on turning the tables on them!

It is nearly the end of Mildred's first year at Cackle's Academy & everyone is happy, except for Miss Cackle! She's short with all the students, particularly Mildred whom she threatens to expel. The girls soon learn that, it is in reality Agatha, Miss Cackle's evil twin, returned to take over the school! Now they must prove it to the other teachers & save the day!

There's a blizzard raging outside & the girls are desperately trying to stay warm. Amidst all the chaos, who should arrive seeking shelter from the weather, but Chief Wizard Hellibore, who is in a particularly mischievous mood & pronounces the day to be an upside-down day. Everything is turned on its head; teachers and pupils change places and there are games instead of lessons!

Mildred & Jadu's expulsions are on the horizon & the other girls try to find a way to save them. The girls plan on running Maude for Head girl hoping to use their influence to save the two. When that plan falls through they decide steal Ms. Cackle's spell book & they end up creating a danger far greater than they've ever faced! Now it's up to Mildred to save the day!

The young witch in training, Mildred Hubble, has a less than desirable start of her first year at Miss Cackle's Academy as she makes quick enemies with the prissy Ethel Hallow & the tyrannical Miss Hardbroom for arriving late on her first day! To make matters worse, Mildred quickly finds herself in deep trouble & is on the verge of being expelled!

A trip organized by Miss Drill is to be a strictly "no magic" camping trip. Things get even worse when the group encounters a Scout troop of mortal boys (Including Jay Baruchel) also camping in the woods. The two groups merge to compete together in team building activities. Soon though the "no magic" rule goes out the window, as Ethel is determined to win.

The girls are learning finger sparks to enhance the effect of Spells with Miss Hardbroom. Ethel delicately zaps away one pine cone, while Mildred puts a hole in the cupboard door. Not all the Hallows are at the top of the class though, as Sybil fails her broomstick flying test. Mildred tries to make her feel more comfortable, but for some reason, she always seems to say the wrong thing.