 Robert BeattyDr. Mark Benton | Dr. Mark Benton |
 Elizabeth SellarsDella Freeman | Della Freeman |
 Peter CokeDet. Insp. George Bellamy | Det. Insp. George Bellamy |
| HHugh KellyDr. Craig | Dr. Craig |
 Vida HopeJackie Leroy | Jackie Leroy |
| JJanet ButlerSister Rogers | Sister Rogers |
 Ferdy MayneCharles Constance | Charles Constance |
 James RaglanSupt. Grayson | Supt. Grayson |
 Hugh PryseMr. Rattray | Mr. Rattray |
 George BensonPrescott | Prescott |
 Roger DelgadoFelix Galegos | Felix Galegos |
 Frank AtkinsonRailway Ticket Clerk (uncredited) | Railway Ticket Clerk (uncredited) |
| DDonald ConlonHelios Restaurant Patron (uncredited) | Helios Restaurant Patron (uncredited) |
| AArthur DibbsHelios Restaurant Patron (uncredited) | Helios Restaurant Patron (uncredited) |
| RRobert GregoryMan at Northolt Airport (uncredited) | Man at Northolt Airport (uncredited) |
| JJean HardwickeSister (uncredited) | Sister (uncredited) |
| BBarry JohnsHospital Orderly (uncredited) | Hospital Orderly (uncredited) |
| AAnthony LangJohnny (uncredited) | Johnny (uncredited) |
 Ronald Leigh-HuntSgt. Lewis (uncredited) | Sgt. Lewis (uncredited) |
| RRichard NellerHospital Visitor (uncredited) | Hospital Visitor (uncredited) |
| HHarold SandersonHospital Visitor (uncredited) | Hospital Visitor (uncredited) |
| MMarc SheldonWaiter (uncredited) | Waiter (uncredited) |
 Toke TownleyFred Barker (uncredited) | Fred Barker (uncredited) |
