Putting an end to the carnival caused a dimensional crash-landing in the Land of Oz. That put the girls on the trail of the cause of the animal transformations — the Wicked Witch of the West — a title now taken by the ancient sorceress Circe.
Along the way, Beryl had a run-in with the Nome King, who gave her a very particular armor as a parting gift.
Unfortunately, a summoning during a "Protection against the Dark Arts" lesson goes awry, and Daleks from another timeline threaten to make a dimensional incursion. Fortunately Beryl springs into action, aided by the ever useful Grease spell.
This time her hands are manacled by the form-shifting Nome King armor recharging its magic, but of course this won't stop her.