Four to Doomsday is the second serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 18 to 26 January 1982.

Herbert Tsangtse Kwouk, was a British actor. He is perhaps best known for his role as Cato in the Pink Panther films. He made appearances in many television programmes, including a portrayal of Imperial Japanese Army Major Yamauchi in the British drama series Tenko and as Entwistle in Last of the Summer Wine.