The Worst Witch (2017): Season 3, Episode 12

3 - 12: Ethel Hallow to the Rescue, Part 1

With Miss Bat's Wedding approaching there is still no sign of Indigo Moon. When a wedding gift of a Wishing Star arrives Mildred and Ethel hatch a plan to steal the wish to help find Indigo. This goes horribly wrong when Ethel uses the wish to summon Indigo with the intention of destroying the Academy unless Miss Hardbroom surrenders to Indigo