Sherlock. Even though Sheppard is an English actor, it was his first appearance in a British-made television show. For the scene depicting the older Canton Delaware, the producers originally planned that Sheppard would appear older using makeup effects. However, Sheppard suggested instead that his father and actor, William Morgan Sheppard, play the role, a suggestion that was accepted. American actor Stuart Milligan was cast as President Nixon, which he said he found exciting, having played other presidents in the past, including Dwight D. Eisenhower. Prosthetic pieces were applied on Milligan's cheeks, nose, and ears to make him resemble Nixon as much as possible. He also practiced how Nixon would speak, but initially found it difficult since he had to wear fake teeth. Milligan previously appeared in the animated Tenth Doctor special Dreamland as the voice of Colonel Stark. Chuk Iwuji, who played Carl, previously appeared in the Seventh Doctor audio drama A Thousand Tiny Wings, where he played Joshua Sembeke. Filming and effects This pair of episodes marks the first time that Doctor Who has filmed principal photography footage within the United States; the American-produced TV movie of 1996 was filmed in Canada, and some second unit establishing shots of New York and the Statue of Liberty were filmed on Liberty Island for the episode "Daleks in Manhattan", but none of the cast of the episode were involved in the shoot. Filming took place in the state of Utah. For the opening shot for the location, director Toby Haynes wanted it to be epic so that the audience could recognise where the episode was set. Scenes on the roadway were filmed on U.S. Route 163 (several miles east of the coordinates listed on the Doctor's invitations). The crew wanted to add as many American icons as they could into those shots, including a Stetson hat, a 1950s Edsel Villager, and a yellow school bus. Moffat, having enjoyed writing episodes featuring River Song, wanted to give her an impressive entrance. Haynes had actress Alex Kingston block the sunlight from the camera angle and blow smoke from her revolver. The scenes involving the picnic and the future-Doctor dying took place on the shore of Lake Powell. The suit worn by the future-Doctor's killer was a fabricated replica of an Apollo space suit. In filming the death scene the filming crew noticed that Karen Gillan was genuinely upset and "was acting her heart