In early 20th-century England, the Mooneys are an eccentric clan live in a large rural home. Invalid patriarch Pa is a retired medical doctor claiming to be 199 years old. Phoebe, the eldest daughter, runs the household. Eldest son Mortimer is a businessman who conducts the finances and contributes to the income. Younger daughter Monica is a sadist who keeps live rats as pets, frequently mutilating them and other small animals. Youngest son Malcolm is a half-wit with animalistic tendencies to the point where he's kept locked in a room with live chickens. But the whole family have a dark, furry secret.

Hope Stansbury
as Monica Mooney

Jackie Skarvellis
as Diana (as Jackie Skarvelis)

Noel Collins
as Mortimer Mooney

Joan Ogden
as Phoebe Mooney

Douglas Phair
as Pa Mooney

Ian Innes
as Gerald

Berwick Kaler
as Malcolm Mooney

Andy Milligan
as The Gunsmith (as George Clark) / Mr. Micawber (as Chris Shore)

Lillian Frit
as Rebecca (as Lillian Frith)