Buster Crabbe

as Buck Rogers

Constance Moore

as Wilma Deering

Jackie Moran

as George 'Buddy' Wade

Anthony Warde

as Killer Kane

C. Montague Shaw

as Prof. Huer

William Gould

as Air Marshal Kragg

Philson Ahn

as Prince Tallen

Guy Usher

as Aldar

Henry Brandon

as Capt. Laska

Wheeler Oakman

as Lt. Patten

Kenne Duncan

as Lt. Lacy

Jack Mulhall

as Capt. Rankin

Reed Howes

as Capt. Roberts

Carleton Young

as Scott

Karl Hackett

as Councillor Krenko

John Harmon

as Hidden City Air Controller

Wade Boteler

as Prof. Wade

Al Bridge

as Dynamo Room Floor Guard

Roy Butler

as Control Officer

Eddy Chandler

as Captain of Dirigible

Lane Chandler

as Army Official at Wade's Lab

Russ Clark

as Lt. Carson

James Conaty

as Kane Councilman

Cyril Delevanti

as Saturnian Councilman

Frank Ellis

as Kane Soldier

Jack Gardner

as Prof. Huer's Lab Assistant

Kenneth Harlan

as Reporter at Wade's Lab

Ben Lewis

as Cell Guard (uncredited)

Theodore Lorch

as Kane's Council Member

Edmund Mortimer

as Member of War Council

Eddie Parker

as Council-Room Guard

Stanley Price

as Capt. Martin / Zugg Man

David Sharpe

as Kane Pilot / Hidden City Sentry / Saturnian Lieutenant

Tom Steele

as Kane Pilot / Hidden City Tech / Balcony Guard