| Christopher Lee | James Hildern |
| Peter Cushing | Emmanuel Hildern |
| Lorna Heilbron | Penelope Hildern |
| George Benson | Waterlow |
| Kenneth Warren | Charles Lenny |
| Catherine Finn | Emily |
| Michael Ripper | Carter Wearing Derby |
| Duncan Lamont | Inspector |
| Harry Locke | Barman |
| Jenny Runacre | Marguerite Hildern |
| Hedger Wallace | Doctor Perry |
A Victorian scientist injects his daughter with the just-add-water essence of evil.
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