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| Cast |
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| Dr Mike Vernon | JUDD, Edward |
| Sita, leader of the Lystrians | TANI, Yoko |
| Dr Claire Harland | GEARON, Valerie |
| Brian Carter | BROOK, Lyndon |
| Lystrian man | YOUNG, Eric |
| Nurse Lim | TSAI Chin |
| Major Muncaster | INGHAM, Barrie |
| Lawrence Blackburn | SHARP, Anthony |
| Police Sergeant Draycott | HOUSTON, Glyn |
| Sister Evans | CASTLE, Ann |
| Dundy | TATE, John |
| Barbara Gough | LODGE, Jean |
| Sister Kelly | MARTIN, Ann |
| Ted | WALL, Tony |
| Harry | THOMAS, Peter |
| Lystrian woman | RAIA, Cali |
| Morgan | KINGSTON, Mark |
| Sergeant Williams | LEYSHON, Emrys |
| Lloyd | CRACKNELL, Leonard |
| Elaine | BIDMEAD, Stephanie |
| lorry driver | MITCHELL, Norman |
| Old Joe | SINCLAIR, Peter |
| telephone operator | AUBREY, Diane |
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| Credits |
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| Directed by | BRIDGES, Alan |
| Production Company | Merton Park |
| Produced by | GREENWOOD, Jack |
| Production Manager | GREENWOOD, Laurie |
| Production Secretary (uncredited) | DAWSON, Angela |
| Assistant Director | LEWIS, Ted |
| Assistant Director (2nd) (uncredited) | PURDIE, Ron |
| Assistant Director (3rd) (uncredited) | ATCHELER, Raymond |
| Continuity | OWENS, Marjorie |
| Casting Director | CURTIS, Ronald |
| Screenplay by | MARSHALL, Roger |
| From an original story by | HOLMES, Robert |
| Director of Photography | WILSON, James |
| Camera Operator | ALLWORK, Peter |
| Focus Puller (uncredited) | ELLIOTT, Gerry |
| Clapper Loader (uncredited) | EVANS, Mike |
| Stills (uncredited) | ORTON, Eddie |
| Special Effects | WHITEHOUSE, Ronnie |
| | KINE, Jack |
| | SHIELDS, Stan |
| Film Editor | HOLDING, Derek |
| Assistant Editor (uncredited) | BRAY, Tony |
| Art Director | MacGREGGOR, Scott |
| Assistant Art Director (uncredited) | GOSWELL, Tom |
| Draughtsman (uncredited) | RODERICK-JONES, Alan |
| Scenic Artist (uncredited) | WOOD, Gilbert |
| Wardrobe | WELCH, Eileen |
| Make up | ROYSTON, Benny |
| Hairdresser | BEAR, Jean |
| Music | EBBINGHOUSE, Bernard |
| Sound Recordists | RIDER, Sidney |
| | LAW, Red |
| Sound Camera Operator (uncredited) | COX, Harold |
| Sound Assistant (uncredited) | LECKER, Paul |
| Boom Operator (uncredited) | OTTER, Tom |
| Dubbing Crew (uncredited) | LAW, Red |
| | EVERETT, Gordon |
| Sound Editors | BLAMEY, Brian |
| | NORMAN, Roy |
| Studio | Merton Park |
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