Prisoner is Australian.
Network Ten . Network Ten is the one of five national free-to-air networks in Australia . Prisoner is an Australian soap opera set in the Wentworth Detention Centre , a fictional women 's prison . The Reg Grundy Organisation ( later the Grundy Organisation , then Grundy Television and known informally as Grundy 's ) was an Australian television production company founded in 1959 by businessman Reg Grundy .