Harry Potter star Miriam Margolyes says she turned down a role with Marvel — because she didn't want to be in Georgia during the filming. Margolyes, who played Professor Pomona Sprout in Harry Potter and the Chamber of Secrets as well as Harry Potter and the Deathly Hallows — Part 2, revealed in her new autobiography Oh Miriam! that she turned down a role in the WandaVision spinoff Agatha.