Mike Vernon
Leader of the Lystrians (as Yoko Tani)
Claire Harland
Carter
The Lystrian (as Eric Young)
Nurse Lim
Major Muncaster
Blackburn
Police Sergeant Draycott
Sister Evans
Dundy
Barbara Gough
Sister Kelly
Ted
Harry
Lystrian Woman
Morgan
Sergeant Williams
Lloyd
Elaine
Lorry Driver
Old Joe
Telephone Operator