Donald Sumpter

as Donald Neilson

Debbie Farrington

as Lesley Whittle

Marjorie Yates

as Neilson's Wife

Sylvia O'Donnell

as Neilson's Daughter

Andrew Burt

as Lesley's Brother

Alison Key

as Lesley's Sister-in-Law

Ruth Dunning

as Lesley's Mother

David Swift

as Det. Chief Superintendent