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