Characters played by Pat O'Brien
Chief Michael 'Mike' Mallory
Characters played by George Murphy
Lt. Thomas L. 'Tom' Sands
Characters played by Jane Wyatt
Myra Mallory
Characters played by Jackie Cooper
Joe 'Babe' Duttson
Characters played by Carl Esmond
Richard 'Dutch' Kroner
Characters played by Max Baer
Coxswain G. Berringer
Characters played by Desi Arnaz
Pat Tarriba
Characters played by Ray Collins
Capt. McCall
Characters played by Lee Bonnell
Kovac
Characters played by Frank Jenks
Sampier
Characters played by John McGuire
James Bayless
Characters played by Frank Fenton
Hodum
Characters played by Joey Ray
James Dennis
Characters played by Marten Lamont
Lt. Cmdr. Murray - navy doctor
Characters played by Stanley Andrews
Judge Advocate
Characters played by George Blagoi
U-Boat Captain
Characters played by Sven Hugo Borg
U-Boat First Officer
Characters played by Egon Brecher
U-Boat Commander
Characters played by Joe Cunningham
Mr. Duttson
Characters played by Helmut Dantine
Frightened Young German Seaman
Characters played by Edgar Dearing
Bud
Characters played by Ralph Dunn
Cop Bringing Sampier
Characters played by Bud Geary
Quartermaster McPhail
Characters played by Joseph W. Girard
Naval Captain at Hearing
Characters played by William Haade
Pier 7 Guard
Characters played by Russell Hoyt
Minor Role
Characters played by Mike Lally
Merchant Marine Sailor with Hose
Characters played by Howard Lane
Lookout
Characters played by Lyle Latell
Oiler
Characters played by Jack Martin
U-Boat First Officer
Characters played by George Melford
Chief Engineer
Characters played by Monte Montague
Third Mate
Characters played by William H. O'Brien
Clerk at Hearing
Characters played by Cyril Ring
Mr. Reynolds
Characters played by Franklin D. Roosevelt
Self
Characters played by Hans Schumm
U-51 Captain Recognizing Kroner
Characters played by Robert R. Stephenson
First Officer of 'Odin'
Characters played by Fred Sweeney
Lookout
Characters played by Sigfrid Tor
German First Officer
Characters played by Nicholas Vehr
U-Boat First Officer
Characters played by Wilhelm von Brincken
Captain of 'Odin'
Characters played by Hans Heinrich von Twardowski
U-Boat Captain
Characters played by Malcolm Waite
Top Lookout
Characters played by Max Waizmann
German Agent
Characters played by Mary Young
Mrs. Duttson