Boris KarloffDr. Laurience
Anna LeeDr. Clare Wyatt
John LoderDick Haslewood
Frank CellierLord Haslewood
Donald CalthropClayton
Cecil ParkerDr. Gratton
Lyn HardingProf. Holloway
Clive MortonJournalist
D.J. WilliamsLandlord
Vincent HolmanMr. Gray
Charles RolfePolice Constable
Bryan Powley
Robert StevensonDirector
John L. BalderstonScreenplay
Sidney GilliatScreenplay
L. du Garde PeachScreenplay
Michael BalconProducer