David Walliams a 'challenge' to work with in Doctor Who

Karen Gillan says she found it an amusing challenge working with comedian and actor David Walliams in a new episode of Doctor Who. The Little Britain actor plays a "submissive" alien mole called Gibbis in a forthcoming storyline called The God Complex. The 23-year-old, who plays Amy Pond, says she couldn't stop laughing on set. "He is so funny," she said. "It's hard working with David Walliams because he is constantly making you laugh."
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