King of Alcatraz

Dale Borden

Raymond Grayson

Captain Glennan

Steve Murkil

Robert MacArthur

Lou Gedney

First Mate Rogers (as Richard Stanley)

Harry Vay

Murok

Dave Carter

Olaf

'Nails' Miller

Dixie (as Dorothy Howe)

Officer

1st Radio Operator

Radio Operator (as Philip Warren)

Matthew Talbot

Gus Banshek

Bonnie Larkin (uncredited)