Margolyes is take on the role of Madame Morrible, and Planer will be The Wizard. The British actors join Idina Menzel, who will reprise her Tony-winning performance as Elphaba, and Adam Garcia, who has been cast as Fiyero.

The show officially opens at London’s Victoria Apollo, currently host to Billy Joel’s Movin’ Out, on Sept. 27; previews begin Sept. 7.

A veteran of stage and screen, Margolyes is best known for her film work with such roles as Professor Sprout in “Harry Potter and the Chamber of Secrets,” Nurse in Baz Luhmann’s “Romeo + Juliet” and Mrs. Mingott in Scorsese’s “The Age of Innocence.”

Planer first became well known playing the hippy Neil in the anarchic British sitcom "The Young Ones" and made his theatrical debut in the original London cast of Evita. Other stage credits include the West End version of Chicago and We Will Rock You. In Sept. 2005 he made his West End debut as playwright with his comedy On the Ceiling, about the unsung artisans who worked with Michaelangelo.

Menzel, who will appear in the West End version of Wicked until the New Year, won the 2004 Best Performance by a Leading Lady in a Musical Tony for her portrayal of Elphaba, the green-skinned girl who is destined to become the not-so Wicked Witch of the West. The musical offers a prequel vision of the iconic 1939 movie “The Wizard of Oz.” Based on Gregory Maguire’s novel, Winnie Holzman’s book follows the fortunes of the film’s two sorceresses, Elphaba and her popular school roommate Glinda, (not yet cast).

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