There are many burning questions about the sci-fi animated TV series Futurama, from whether Scruffy the janitor is a zombie to why Richard Nixon howls. Like other popular animated shows, Futurama has a tradition of celebrity guest stars playing themselves, including Al Gore, Pauly Shore, Leonard Neroy, George Takei, and Stephen Hawking. The series also featured a unique take on historical figures, such as Richard Nixon and George Washington.