Penn & Teller: Fool Us is a British-American television programme. Hosted by Jonathan Ross in its first two seasons, then Alyson Hannigan from season three. Fool Us was filmed at Fountain Studios in London, England (Season 1) and the Penn & Teller Theater in Las Vegas (Season 2 onward). Fool Us is a magic competition in which magicians perform tricks in front of American magician-comedian duo Penn & Teller. If Penn & Teller cannot figure out how a trick was done, the magician or magicians who performed it win a five-star trip to Las Vegas to perform as the opening act in Penn & Teller's world-famous show, also at the Rio Hotel & Casino.