| Cast list | | James Stephenson | as | Dr. Paul Venner | | Geraldine Fitzgerald | as | Dr. Mary Murray | | Donald Crisp | as | Dr. Drewett | | Barbara O'Neil | as | Miss Leeming | | Montagu Love | as | Dr. Blake | | Sig Ruman | as | Professor Herman Von Reiter | | George P. Huntley Jr. | as | Dr. Thornton | | Richard Ainley | as | Dr. Hale | | Bruce Lester | as | Dr. Bentley | | Leonard Mudie | as | Mr. Foster, a Patient | | Doris Lloyd | as | Mrs. Foster | | Frank Reicher | as | Dr. Esterhazy | | Hermine Sterler | as | Miss Hoffman, Von Reiter's Secretary | | Billy Bevan | as | Chivers | | Clare Verdera | as | Miss Dennis, Nurse with Mr. Foster |
| | Crew list: | | Irving Rapper (Director) | | A.J. Cronin (Writer) | | Howard Koch (Writer) |
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