The episode begins with Mildred Hubble and her friends returning to Cackle's Academy. After a botched potions experiment, Mildred's appearance is permanently transformed into a girl named . To reverse the spell before sunset, she must find and complete three legendary "impossible" challenges. The Three Challenges
Involves navigating a complex stone template or grid found in an abandoned tower room.
Continues to be strict with Mildred, fearing her "chaotic magical abilities" will lead to disaster. [S4E1] The Three Impossibilities
If Mildred fails to complete the challenges by dusk, the transformation spell becomes permanent, and her old self will be gone forever.
A second riddle or grid that the girls must solve quickly. The episode begins with Mildred Hubble and her
The "Three Impossibilities" are a set of tasks left by the very first Miss Cackle. According to legend, completing them undoes any spells cast on that day.
This final challenge is originally unreadable and ruined on the stone wall, forcing Mildred to use her ingenuity to figure it out before time runs out. Key Characters & Plot Points The Three Challenges Involves navigating a complex stone
is the first episode of the fourth series (season) of the 2017 TV adaptation of The Worst Witch . It originally aired on CBBC in January 2020. Story Overview