Billy Halop

Billy Adams

Huntz Hall

Toby Nelson

Gabriel Dell

Bilge

Reed Hadley

Carl Tonjes

Mary Field

Aggie Nelson

John McGuire

Tom Adams

Marcia Ralston

Leah Carlton

Stanley Blystone

Capt. Olaf Nelson

Edward Keane

Elliott Carlton

Richard Alexander

Jenkins

Ernie Adams

Zeke

Jack Rube Clifford

Pug Anderson

Eddie Dunn

Whaler Captain

Forrest Taylor

Fenwick the Inventor

James Blaine

Desk Sergeant

Ed Cassidy

Guard at Hospital

Jack Cheatham

Duke

Dick Curtis

Mate on the 'Astoria'

John Merton

First Island Guard

Jack Mulhall

'Dolphin' Radioman

Paul Newlan

Chris - Second Island Guard

Eddie Parker

Coral Strand Crewman

Jack Perrin

Island Guard-Launch Pilot

House Peters Jr.

Agent Burke

George Sherwood

Island Guard

Mickey Simpson

Angry Motorist

Tom Steele

Coral Strand Crewman / Whaler Crewman

Frank Wayne

Fenwick's Guard

Jack Holmes