 Cesar RomeroPhilip 'Phil' O'Dell | Philip 'Phil' O'Dell |
| BBernadette O'FarrellHeather McMara | Heather McMara |
 Lois MaxwellMargaret 'Peggy' Maybrick | Margaret 'Peggy' Maybrick |
 Geoffrey KeenChristopher Hampden | Christopher Hampden |
 Campbell SingerInspector Rigby | Inspector Rigby |
 Alastair HunterDet. Sgt. Reilly | Det. Sgt. Reilly |
 Mary MackenzieMarilyn Durant | Marilyn Durant |
 Lloyd LambleMartin Sorrowby | Martin Sorrowby |
| FFrank BirchBoswell - Airport Manager | Boswell - Airport Manager |
 Wensley PitheySid - Bartender | Sid - Bartender |
| RReed De RouenConnors | Connors |
 Peter SwanwickSmithers | Smithers |
 Richard JohnsonDanny McMara - Hit-and-Run Victim | Danny McMara - Hit-and-Run Victim |
 Bill FraserSales Manager | Sales Manager |
 Lisa LeeDonna Devore | Donna Devore |
| LLionel HarrisAllan Mellon | Allan Mellon |
 Betty CooperDr. Campbell - Asylum Superintendent | Dr. Campbell - Asylum Superintendent |
| CClare JamesMiss Andrews - Asylum Receptionist | Miss Andrews - Asylum Receptionist |
 Katie JohnsonMad Mary - Old Inmate at Murder Scene | Mad Mary - Old Inmate at Murder Scene |
 Jacques CeyHead Waiter | Head Waiter |
| JJean BaylessDelmont Switchboard Operator (as Jean Bayliss) | Delmont Switchboard Operator (as Jean Bayliss) |
| SStuart NicholSteve | Steve |
| MMarguerite BrennanDesk Clerk at Heather's Apartment | Desk Clerk at Heather's Apartment |
 Robert AdairJohn - Film Director | John - Film Director |
| TTerry CarneyMinor Role (uncredited) | Minor Role (uncredited) |
 Robert DorningAirline Reservations Clerk (uncredited) | Airline Reservations Clerk (uncredited) |
| JJosephine DouglasNurse at Glenhaven Sanatorium (uncredited) | Nurse at Glenhaven Sanatorium (uncredited) |
| CChristina ForrestMinor Role (uncredited) | Minor Role (uncredited) |
| JJack HowarthMinor Role (uncredited) | Minor Role (uncredited) |
| RRobert MooreMinor Role (uncredited) | Minor Role (uncredited) |
