[s4e1] The Three Impossibilities May 2026

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

Continues to be strict with Mildred, fearing her "chaotic magical abilities" will lead to disaster. [S4E1] The Three Impossibilities

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 is the first episode of the fourth series

Disguised as "Ursula Catnip" (played by Lydia Page, replacing Bella Ramsey), she struggles with her new identity while trying to fix her mistake. The episode begins with Mildred Hubble and her

If Mildred fails to complete the challenges by dusk, the transformation spell becomes permanent, and her old self will be gone forever.

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