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| Cast |
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| Dr John Holden | ANDREWS, Dana |
| Joanna Harrington | CUMMINS, Peggy |
| Dr Julian Karswell | MacGINNIS, Niall |
| Professor Henry Harrington | DENHAM, Maurice |
| Mrs Karswell | SEYLER, Athene |
| Professor Mark O'Brien | REDMOND, Liam |
| Inspector Mottram | LEECH, Richard |
| Mr Meek | BECKWITH, Reginald |
| Lloyd Williamson | ROBERTS, Ewan |
| Kumar | ELLIOTT, Peter |
| Mrs Meek | GREENWOOD, Rosamund |
| Rand Hobart | WILDE, Brian |
| Detective Simmons | LAMBLE, Lloyd |
| superintendent | HOBBES, Peter |
| chemist | LLOYD-PACK, Charles |
| librarian | SALEW, John |
| Mrs Hobart | BARROW, Janet |
| farmer | HERBERT, Percy |
| air hostess | TRACY, Lynn |
| Bates, the butler (uncredited) | HORSBRUGH, Walter |
| first reporter (uncredited) | BERKELEY, Ballard |
| second reporter (uncredited) | PEAKE, Michael |
| ticket collector (uncredited) | SHARP, Leonard |
| urchin (uncredited) | RICHMOND, Anthony |
| (uncredited) | BEESLEY, Tatiana |
| (uncredited) | TARRANT, Kenneth |
| (uncredited) | JOHN, Anthony |
| (uncredited) | ASHER, Clare |
| (uncredited) | HOWELL, Robert |
| (uncredited) | HOSLER, Yvette |
| Blake Twins | (uncredited) |
| (uncredited) | HOMEWOOD, Penelope |
| (uncredited) | HOLLIS, Irene |
| (uncredited) | HUNTER, Christopher |
| (uncredited) | ROBERTS, Karen |
| (uncredited) | ASLANOFF, Michelle |
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| Credits |
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| Directed by | TOURNEUR, Jacques |
| Production Company | Sabre Film Productions |
| | Columbia Pictures Corporation |
| Executive Producer | CHESTER, Hal E. |
| Produced by | BEVIS, Frank |
| Production Manager | DAVIDSON, R.L.M. |
| Assistant Director | KEYS, Basil |
| Continuity | GAYLER, Pamela |
| Casting | LENNARD, Robert |
| Screen Play by | BENNETT, Charles |
| | CHESTER, Hal E. |
| Based on the story 'Casting the Runes' by | JAMES, Montague R. |
| Director of Photography | SCAIFE, Ted |
| Special Effects Photography | ONIONS, S.D. |
| Special Effects | BLACKWELL, George |
| | VEEVERS, Wally |
| Film Editor | GORDON, Michael |
| Production Designer | ADAM, Ken |
| Assistant Art Director | GLAZIER, Peter |
| Hair Stylist | LEE, Betty |
| Music Composed by | PARKER, Clifton |
| Music (uncredited) Conducted by | MATHIESON, Muir |
| Sound Recordist | BRADBURN, Arthur |
| Dubbing Editor | CRAFFORD, Charles |
| Transport Manager (uncredited) | FREWIN, Eddie |
| Narrator (uncredited) | GORMAN, Shay |
| Studio | Associated British Elstree Studios |
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