This content is copyright of CelebMix.com. TV and theatre icon Catherine Tate is joining the West End cast of Oh, Mary!, now playing at the Trafalgar Theatre. She will be taking over the role of Mary Todd Lincoln from April 27. The role is currently played by Mason Alexander Park, who will play their final show on April 25. Catherine is best known for her comedy sketch show The Catherine Tate Show as well as her role in Doctor Who.