| Cmdr. Don Winslow | Don Terry | |
| Lt. 'Red' Pennington | Walter Sande | |
| Mercedes Colby | Elyse Knox | |
| Hirota | 菲利普·韩
 | |
| Tasmia | 琼·杜普雷兹
 | |
| CPO Ben Cobb | Edgar Dearing | |
| Reichter Chief thug | Lionel Royce | |
| Heilrich | Henry Victor | |
| Mussanti | Charles Wagenheim | |
| The Scorpion | Nestor Paiva | |
| Detective Collins [Chs. 7 11] (uncredited) | Stanley Blystone | |
| Water Gate Controller (uncredited) | Paul Bryar | |
| Truck Driver [Chs. 8-9] (uncredited) | Jack Cheatham | |
| Captain Holding [Ch. 1] (uncredited) | Richard Cramer | |
| Clark Winslow's aide [Chs. 2-3 9 12-13] (uncredited) | Eddie Dean | |
| Police Dispatcher [Ch. 9] (uncredited) (archive footage) | James Donlan | |
| Coast Guardsman [Ch. 3] (uncredited) | Paul Dubov
 | |
| Air Raid Warden [Ch. 8] (uncredited) | Heenan Elliott | |
| Farmer [Ch. 11] (uncredited) | Al Ferguson | |
| Coast Guardsman with message [Ch. 2] (uncredited) | Jack Gardner | |
| (uncredited) | Fred Graham | |
| Henchman Muller [Ch. 13] (uncredited) | Frank Hagney | |
| Coast Guard pilot (uncredited) | Eddie Hall | |
| Guard in Hospital Hallway [Ch. 8] (uncredited) | Chuck Hamilton | |
