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

Hans Joby

U-Boat Petty Officer

Henry Hunter

Ensign Dyer

Jonathan Hale

Admiral Girard

Leon Ames

Recruiting Officer (uncredited)

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)

John F. Seitz

Director of Photography

Cedric Gibbons

Art Direction

Edwin B. Willis

Set Decoration

Fred Valles

Costume Design

David Snell

Music

Douglas Shearer

Sound Director

Dolly Tree

Costume Design

Urie McCleary

Assistant Art Director

Frank E. Hull

Editor

George B. Seitz

Director

Wells Root

Screenplay

J. Walter Ruben

Producer

Edward Ward

Music

Ralph Wheelwright

Story

Harvey S. Haislip

Screenplay, Story