- Buster Crabbe
- Buck Rogers
- Constance Moore
- Wilma Deering
- Jackie Moran
- 'Buddy' Wade
- Jack Mulhall
- Capt. Rankin
- Anthony Warde
- Killer Kane
- Philson Ahn
- Prince Tallen
- C. Montague Shaw
- Dr. Huer
- Guy Usher
- Aldar
- William Gould
- Air Marshal Kragg
- Henry Brandon
- Capt. Lasca
- Kenne Duncan
- Lt. Lacy
- Reed Howes
- Capt. Roberts
- Wheeler Oakman
- Lieutenant Patten
- Carleton Young
- Scott
- Roy Barcroft
- Kane Officer
- Wade Boteler
- Professor Wade
- Al Bridge
- Dynamo Room Guard
- Roy Butler
- Dynamo Room Guard
- Eddy Chandler
- Dirigible Captain Breaden
- Lane Chandler
- Army Official
- Russ Clark
- Lt. Carson
- James Contay
- Kane's Hednchman
- Cyril Delevanti
- Saturian Councilman
- Frank Ellis
- Kane Soldier
- Jack Gardner
- Huer's Lab Assistant
- Karl Hackett
- Councillor Krenko
- Kenneth Harlan
- Reporter
- John Harmon
- Hidden City Air Controller
- Ben Lewis
- Wilma's Cell Guard
- Theodore Lorch
- Cartwright
- Frank O'Connor
- Lab Man
- Stanley Price
- Captain Martin
- Francis Sayles
- Saturian Councilman
- David Sharpe
- Kane Captain
- Tom Steele
- Patrol Ship 74 Pilot
