
Routine tests on a traffic accident victim lead to shocking discoveries when the man's blood is found to be unidentifiable and x-rays reveal a disc embedded in his brain. His fabulous tale of being an escaped prisoner from an alien spaceship takes a turn for the sinister when the hospital staff realise that they're under a state of siege...
Cast

Edward Judd
Dr. Mike Vernon

Yoko Tani
Leader of the Lystrians
Valerie Gearon
Dr. Claire Harland

Lyndon Brook
Brian Carter

Ric Young
The Lystrian

Tsai Chin
Nurse Lim

Barrie Ingham
Major Muncaster

Anthony Sharp
Lawrence Blackburn

Glyn Houston
Police Sergeant Draycott
Ann Castle
Sister Evans

Jean Lodge
Barbara Gough
Ann Martin
Sister Kelly
Tony Wall
Ted
Peter Thomas
Harry

Mark Kingston
Morgan
Emrys Leyshon
Sergeant Williams
Leonard Cracknell
Lloyd

Stephanie Bidmead
Elaine

Norman Mitchell
Lorry Driver
Peter Sinclair
Old Joe
Diane Aubrey
Telephone Operator
John Tate
Dundy
Crew

Alan Bridges
Director
Roger Marshall
Screenplay

Robert Holmes
Story
Derek Holding
Editor
James Wilson
Director of Photography
Jack Greenwood
Producer
Peter Allwork
Camera Operator
Ronnie Curtis
Casting
Eileen Welch
Costume Design
Jean Bear
Hairstylist
Benny Royston
Makeup Artist
Brian Blamey
Sound Editor
Roy Norman
Sound Editor
Red Law
Sound Recordist
Jack Kine
Special Effects
Stan Shields
Special Effects
Ronnie Whitehouse
Special Effects
Bernard Ebbinghouse
Original Music Composer
Scott MacGregor
Art Direction
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