Flash Gordon, Dale Arden and Dr. Alexis Zarkov visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless, who has set his planet on a collision course with Earth.

Spaceship to the Unknown

Frank Shannon

Al Ferguson

George H. Plympton

Basil Dickey

Buster Crabbe

Alex Raymond

George Cleveland

Constantine Romanoff

Frederick Stephani

Priscilla Lawson

Ray Taylor

Lynton Brent

Theodore Lorch

Ella O'Neill

Lon Poff

Jack 'Tiny' Lipson

Bull Montana

Fred Kohler Jr.

Earl Askam

Charles Middleton

James Pierce

Jean Rogers

Duke York

Richard Alexander

Richard Tucker

Charles McMurphy

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Spaceship to the Unknown

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