- Lee Powell - Captain Roka
- Roland Drew - Prince Barin
- Don Rowan - Captain Torch
- Victor Zimmerman - Lieutenant Thong
- Edgar Edwards - Captain Turan
- Michael Mark - Professor Karm
- Earl Dwire - Janda
- Harry C. Bradley - Keedish
- Sigurd Nilssen - Count Korro
- Mimi Taylor - Verna
- Byron Foulger - Professor Drok
- William Royle - Captain Sudan
- Donald Curtis - Ronal (uncredited)
- Luli Deste - Queen Fria (uncredited)
- Ben Taggart - General Lupi (uncredited)
- Allan Cavan - Man with Thinking Brain (uncredited)
- Jack Roper - Man of Low Intellect (uncredited)
- Reed Howes - Barin's Ship #5 Commander (uncredited)
- Charles Sherlock - Guard Kroad (uncredited)
- Mala - Prince of the Rock People (uncredited)
- Chief Yowlachie - King of the Rock People (uncredited)
- Jack Gardner - Professor Gordon's Radio Operator (uncredited)
- Joey Ray - Professor Gordon's Assistant (uncredited)
- Roy Barcroft - Ming's Soldier / Arborian Sentry (uncredited)
- Lane Chandler - Ming's Soldier (uncredited)
- Gene Rizzi - Ming's Soldier (uncredited)
- Wheaton Chambers - Scientist (uncredited)
- John Elliott - Scientist (uncredited)
- Jack George - Scientist (uncredited)
- Jean Brooks - Olga (uncredited)
- Carmen D'Antonio - Ming's Dancing Girl (uncredited)
- Vivian Mason - Ming's Gong Girl (uncredited)
- Ernie Adams - (uncredited)
- Clarice Sherry - (uncredited)
- Tom Steele - Ming's Pilot (uncredited)
- Eddie Parker - Arborian Prison Guard (uncredited)
- Bill Hunter - Guard (uncredited)
- Robert Blair - (uncredited)
- Harold Daniels - (uncredited)
- Pat Gleason - (uncredited)
- Paul Reed - (uncredited)
- Charles Waldron Jr. - (uncredited)
- Ray Taylor
- Alex Raymond
- Barry Shipman
Buster Crabbe interpreta a Flash Gordon en la película.
Carol Hughes interpreta a Dale Arden en la película.
Charles Middleton hace el papel de Emperor Ming.
Anne Gwynne interpreta a Sonja en la película.
Frank Shannon interpreta a Dr. Zarkov en la película.
John Hamilton interpreta a Professor Gordon en la película.
Herbert Rawlinson interpreta a Dr. Frohmann en la película.
Tom Chatterton hace el papel de Professor Arden.
Shirley Deane interpreta a Princess Aura en la película.
Lee Powell interpreta a Captain Roka en la película.
Roland Drew interpreta a Prince Barin en la película.
Don Rowan interpreta a Captain Torch en la película.
Victor Zimmerman interpreta a Lieutenant Thong en la película.
Edgar Edwards hace el papel de Captain Turan.
Michael Mark hace el papel de Professor Karm.
Earl Dwire hace el papel de Janda.
Harry C. Bradley interpreta a Keedish en la película.
Sigurd Nilssen interpreta a Count Korro en la película.
Mimi Taylor interpreta a Verna en la película.
Byron Foulger hace el papel de Professor Drok.
William Royle interpreta a Captain Sudan en la película.
Donald Curtis interpreta a Ronal (uncredited) en la película.
Luli Deste interpreta a Queen Fria (uncredited) en la película.
Ben Taggart interpreta a General Lupi (uncredited) en la película.
Allan Cavan interpreta a Man with Thinking Brain (uncredited) en la película.
Jack Roper interpreta a Man of Low Intellect (uncredited) en la película.
Reed Howes hace el papel de Barin's Ship #5 Commander (uncredited).
Charles Sherlock interpreta a Guard Kroad (uncredited) en la película.
Mala interpreta a Prince of the Rock People (uncredited) en la película.
Chief Yowlachie interpreta a King of the Rock People (uncredited) en la película.
Jack Gardner interpreta a Professor Gordon's Radio Operator (uncredited) en la película.
Joey Ray hace el papel de Professor Gordon's Assistant (uncredited).
Roy Barcroft hace el papel de Ming's Soldier / Arborian Sentry (uncredited).
Lane Chandler interpreta a Ming's Soldier (uncredited) en la película.
Gene Rizzi hace el papel de Ming's Soldier (uncredited).
Wheaton Chambers interpreta a Scientist (uncredited) en la película.
John Elliott hace el papel de Scientist (uncredited).
Jack George hace el papel de Scientist (uncredited).
Jean Brooks interpreta a Olga (uncredited) en la película.
Carmen D'Antonio interpreta a Ming's Dancing Girl (uncredited) en la película.
Vivian Mason interpreta a Ming's Gong Girl (uncredited) en la película.
Ernie Adams interpreta a (uncredited) en la película.
Clarice Sherry interpreta a (uncredited) en la película.
Tom Steele hace el papel de Ming's Pilot (uncredited).
Eddie Parker interpreta a Arborian Prison Guard (uncredited) en la película.
Bill Hunter interpreta a Guard (uncredited) en la película.
Robert Blair interpreta a (uncredited) en la película.
Harold Daniels hace el papel de (uncredited).
Pat Gleason interpreta a (uncredited) en la película.
Ernie Payson interpreta a (uncredited) en la película.
Paul Reed interpreta a (uncredited) en la película.
Charles Waldron Jr. interpreta a (uncredited) en la película.
Saul A. Goodkind interpreta a Various Characters (voice) (uncredited) en la película.
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