Buster Crabbe
Buck Rogers
Constance Moore
Wilma Deering
Jackie Moran
George 'Buddy' Wade
Anthony Warde
Killer Kane
C. Montague Shaw
Prof. Huer
William Gould
Air Marshal Kragg
Philson Ahn
Prince Tallen
Guy Usher
Aldar
Henry Brandon
Capt. Laska
Wheeler Oakman
Lt. Patten
Kenne Duncan
Lt. Lacy
Jack Mulhall
Capt. Rankin
Reed Howes
Capt. Roberts
Carleton Young
Scott
Karl Hackett
Councillor Krenko
John Harmon
Hidden City Air Controller
Wade Boteler
Prof. Wade
Al Bridge
Dynamo Room Floor Guard
Roy Butler
Control Officer
Eddy Chandler
Captain of Dirigible
Lane Chandler
Army Official at Wade's Lab
Russ Clark
Lt. Carson
James Conaty
Kane Councilman
Cyril Delevanti
Saturnian Councilman
Frank Ellis
Kane Soldier
Jack Gardner
Prof. Huer's Lab Assistant
Kenneth Harlan
Reporter at Wade's Lab
Ben Lewis
Cell Guard (uncredited)
Theodore Lorch
Kane's Council Member
Edmund Mortimer
Member of War Council
Eddie Parker
Council-Room Guard
Stanley Price
Capt. Martin / Zugg Man
David Sharpe
Kane Pilot / Hidden City Sentry / Saturnian Lieutenant
Tom Steele
Kane Pilot / Hidden City Tech / Balcony Guard