Murphy's work as a voice actor in films includes Thurgood Stubbs in The PJs, Donkey in DreamWorks' Shrek series, and the Chinese dragon Mushu in Disney's Mulan. In some films, he plays multiple roles in addition to his main character, intended as a tribute to one of his idols Peter Sellers, who played multiple roles in Dr. Strangelove and elsewhere. He has played multiple roles in Coming to America, Wes Craven's Vampire in Brooklyn, the Nutty Professor films (where he played the title role in two incarnations, plus his character's father, brother, mother, and grandmother), Bowfinger, The Adventures of Pluto Nash, Norbit, and Meet Dave. As of 2014[update], Murphy's films have grossed over $3. 8 billion in the United States and Canada box office and $6. 6 billion worldwide. In 2015, his films made him the sixth-highest grossing actor in the United States.