Don Winslow of the Navy

Gang Radioman Barker

The CINCUS [Ch. 1]

Spencer Merlin

Saboteur Kramer [Chs. 3-4]

Henchman Corley

Mercedes Colby

Misty Gaye

Paul Barsac

Enemy Sub Capt. Tranker [Ch. 1]

Henchman Spike