Buster Crabbe as Flash Gordon

Jean Rogers as Dale Arden

Frank Shannon as Dr. Hans Zarkov

Charles Middleton as Ming the Merciless

Priscilla Lawson as Princess Aura

Richard Alexander as Prince Barin

Jack 'Tiny' Lipson as King Vultan

James Pierce as Prince Thun

Theodore Lorch as High Priest

Earl Askam as Officer Torch

Richard Tucker as Professor Gordon

George Cleveland as Professor Hensley

Glenn Strange as Gocko/Robot/Soldier

Lon Poff as First High Priest

Constantine Romanoff as Monkey Man (uncredited)

Duke York as King Kala

Muriel Godspeed as Zona

House Peters Jr. as Shark Man

John Bagni as Hawkman Throne Room Guard

Roy Barcroft as Throne Guard

Carroll Borland as Woman in Ming's Palace

Lynton Brent as Transcontinental Plane Steward

Don Brodie as Radio Scientist

Lane Chandler as Ming's Soldier

Noble 'Kid' Chissell as Guard

Jim Corey as Shark Man

Ray Corrigan as Orangopoid

William Desmond as Hawkman Lookout Captain

Al Ferguson as Spaceograph Operator

Sig Frohlich as Shark Man

Olive Hatch as Aura's Handmaiden

Reed Howes as Pilot

Fred Kohler Jr. as Robot

George Magrill as Ming's Soldier

Charles McMurphy as Atom Furnace Slavedriver

Monte Montague as Ming's Soldier

Bull Montana as Monkey Man

Eddie Parker as Ming's Soldier

Sana Rayya as Priestess of Tigron

Fred Scott as Soldier

Cap Somers as Shark Man

Tom Steele as Plane Passenger

Bunny Waters as Shark Man

Slim Whitaker as Prison Guard

Harry Wilson as Pit Control Operator