Culver is a psychiatrist who uses hypnotism to treat his patients. When Carpenter, a test pilot, comes to see him complaining of blackouts that make his job difficult, Culver tries to mesmerise him into killing his wife.
| Actor | Role |
|---|---|
 Paul CarpenterVal Neal | Val Neal |
 Patricia RocMary Foster | Mary Foster |
 Roland CulverDr. Francis Pelham | Dr. Francis Pelham |
 William HartnellInspector Ross | Inspector Ross |
| GGordon BoydDetective Sergeant Davis | Detective Sergeant Davis |
| EEdgar DriverAtkins | Atkins |
| TTom TannWang | Wang |
 Ellen PollockMiss Barbara Barton | Miss Barbara Barton |
| RRobert SansomSenior Test Flight Official | Senior Test Flight Official |
 Martin WyldeckDr. Bradford | Dr. Bradford |
 John SerretDr. Martin | Dr. Martin |
 Oliver JohnstonDr. Kenyon | Dr. Kenyon |
 Kay CallardSusie | Susie |