Buster Crabbe

Character: Flash Gordon

Carol Hughes

Character: Dale Arden

Charles Middleton

Character: Emperor Ming

Anne Gwynne

Character: Sonja

Frank Shannon

Character: Dr. Zarkov

John Hamilton

Character: Professor Gordon

Herbert Rawlinson

Character: Dr. Frohmann

Tom Chatterton

Character: Professor Arden

Shirley Deane

Character: Princess Aura

Lee Powell

Character: Captain Roka

Roland Drew

Character: Prince Barin

Don Rowan

Character: Captain Torch

Victor Zimmerman

Character: Lieutenant Thong

Edgar Edwards

Character: Captain Turan

Michael Mark

Character: Professor Karm

Earl Dwire

Character: Janda

Harry C. Bradley

Character: Keedish

Sigurd Nilssen

Character: Count Korro

Mimi Taylor

Character: Verna

Byron Foulger

Character: Professor Drok

William Royle

Character: Captain Sudan

Donald Curtis

Character: Ronal (uncredited)

Luli Deste

Character: Queen Fria (uncredited)

Ben Taggart

Character: General Lupi (uncredited)

Allan Cavan

Character: Man with Thinking Brain (uncredited)

Jack Roper

Character: Man of Low Intellect (uncredited)

Reed Howes

Character: Barin's Ship #5 Commander (uncredited)

Charles Sherlock

Character: Guard Kroad (uncredited)

Mala

Character: Prince of the Rock People (uncredited)

Chief Yowlachie

Character: King of the Rock People (uncredited)

Jack Gardner

Character: Professor Gordon's Radio Operator (uncredited)

Joey Ray

Character: Professor Gordon's Assistant (uncredited)

Roy Barcroft

Character: Ming's Soldier / Arborian Sentry (uncredited)

Lane Chandler

Character: Ming's Soldier (uncredited)

Gene Rizzi

Character: Ming's Soldier (uncredited)

Wheaton Chambers

Character: Scientist (uncredited)

John Elliott

Character: Scientist (uncredited)

Jack George

Character: Scientist (uncredited)

Jean Brooks

Character: Olga (uncredited)

Carmen D'Antonio

Character: Ming's Dancing Girl (uncredited)

Vivian Mason

Character: Ming's Gong Girl (uncredited)

Ernie Adams

Character: (uncredited)

Clarice Sherry

Character: (uncredited)

Tom Steele

Character: Ming's Pilot (uncredited)

Eddie Parker

Character: Arborian Prison Guard (uncredited)

Bill Hunter

Character: Guard (uncredited)

Robert Blair

Character: (uncredited)

Harold Daniels

Character: (uncredited)

Pat Gleason

Character: (uncredited)

Ernie Payson

Character: (uncredited)

Paul Reed

Character: (uncredited)

Charles Waldron Jr.

Character: (uncredited)

Saul A. Goodkind

Character: Various Characters (voice) (uncredited)