Prisoner (known in the UK and US as Prisoner: Cell Block H) is an Australian television soap opera, created by Reg Watson, which broadcast on Network Ten from 1979 to 1986, lasting eight seasons and 692 episodes. The series was produced by the Grundy Organisation and was filmed at the then Network Ten Melbourne Studios at Nunawading, and on location. It was the first series in Australia to gain an international cult following, particularly in the United States, but also in Europe - especially the United Kingdom and Sweden, with even Sammy Davis Jr, being a major fan and visiting the set.