 In June 2006, Atherton became part of the original London cast of "Avenue Q" when the show transferred from Broadway to the Noël Coward Theatre in the West End.She played Kate Monster/Lucy the Slut, and continued playing the role until 1 December 2007.She returned to the production, which had then moved to the Gielgud Theatre, in December 2008 and continued playing her roles until 3 October 2009.