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

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

Continues to be strict with Mildred, fearing her "chaotic magical abilities" will lead to disaster.

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.

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

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

Impossibilities — [s4e1] The Three

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

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 [S4E1] The Three Impossibilities

Continues to be strict with Mildred, fearing her "chaotic magical abilities" will lead to disaster. Disguised as "Ursula Catnip" (played by Lydia Page,

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. The "Three Impossibilities" are a set of tasks

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

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