Director:
Terry Green Ben Bolt Christopher Menaul

Casting:
Patrick Mower,
Philip Madoc,
Brendan Price,

UK, 1977

Director:
Ridley Scott

Casting:
Tom Skerritt,
Sigourney Weaver,
Veronica Cartwright,

USA, UK, 1979

Director:
Gordon Flemyng

Casting:
Peter Cushing,
Bernard Cribbins,
Ray Brooks,

UK, 1966