Thunder Afloat

Wallace Beery

John Thorson

Chester Morris

'Rocky' Blake

Virginia Grey

Susan Thorson

Douglass Dumbrille

District Commander

Carl Esmond

U-Boat Captain

Clem Bevans

'Cap' Finch

John Qualen

Milo

Regis Toomey

Ives

Henry Victor

German U-Boat Officer

Addison Richards

Admiral Ross

Sin foto

Hans Joby

U-Boat Petty Officer

Henry Hunter

Ensign Dyer

Jonathan Hale

Admiral Girard

Leon Ames

Recruiting Officer (uncredited)

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Arthur Belasco

Fisherman (uncredited)

Joseph E. Bernard

Fisherman (uncredited)

Wade Boteler

Recruiting Officer (uncredited)

Al Bridge

Fisherman (uncredited)

Rand Brooks

Listener (uncredited)

Don Castle

Radio Operator (uncredited)

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Jack Chapin

Sailor (uncredited)

Tom Chatterton

Lieutenant (uncredited)

Jack Rube Clifford

Captain (uncredited)

Jules Cowles

Man with Finch (uncredited)

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Leigh De Lacey

Mrs. Gill (uncredited)

Joe De Stefani

Fisherman (uncredited)

Edgar Dearing

Petty Officer (uncredited)

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Richard Elmore

Lookout (uncredited)

Frank Faylen

Recruiting Officer (uncredited)

Budd Fine

Survivor (uncredited)

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Allen Fox

Lookout (uncredited)

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Frederick Lee

Sailor (uncredited)

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Eddie Hart

Fisherman (uncredited)

Edward Hearn

Fisherman (uncredited)

Howard Hickman

Surgeon (uncredited)

Earle Hodgins

Fisherman (uncredited)

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Clarke Jennings

Wireless Operator (uncredited)

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Payne B. Johnson

Boy (uncredited)

Charles Jordan

Signalman (uncredited)

Lew Kelly

Sailor (uncredited)

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Jack Kennedy

Fisherman (uncredited)

Milton Kibbee

Fisherman (uncredited)

Claire McDowell

Nurse (uncredited)

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Larry McGrath

Radio Operator (uncredited)

Roger Moore

Orderly (uncredited)

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Philip Morris

Fisherman (uncredited)

Forbes Murray

Naval Aide (uncredited)

Frank Orth

Old Sailor in Bilge Area (uncredited)

Syd Saylor

Wireless Operator Sending Coded Message (uncredited)

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Harold Schlickenmayer

Engineer (uncredited)

Ferdinand Schumann-Heink

German Operator (uncredited)

Hans Schumm

German Sailor Looking for Wireless (uncredited)

Harry Semels

Cook on Tugboat (uncredited)

Lee Shumway

Sailor (uncredited)

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Robert R. Stephenson

German Sailor (uncredited)

Harry Strang

Shore Patrol Sailor (uncredited)

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Walter Thiele

Young German Sailor (uncredited)

Emmett Vogan

Junior Officer Standing by Map (uncredited)

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Wolfram Von Bock

German Officer (uncredited)

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Hans von Morhart

German Sailor (uncredited)

Doodles Weaver

Sailor (uncredited)