- Clyde Beatty
- Clyde Beatty
- Syd Saylor
- Larry Henderson
- Cecilia Parker
- Ruth Robinson
- Edward LeSaint
- Capt. Robinson
- Warner Richmond
- Sharkey
- Wheeler Oakman
- Kirby
- Lew Meehan
- Flynn--Crewman
- Max Wagner
- Slade--Crewman
- Hal Taliaferro
- Crewman
- Ernie Adams
- Pete - Roustabout [Ch. 1]
- Jack Carlyle
- Cook
- Maston Williams
- Thompson
- Wes Warner
- Jackman--Crewman
- Slim Whitaker
- Slim - Crewman
- Jim Corey
- Steve--Crewman
- Lionel Backus
- Sandy
- Charles Gemora
- Gorilla
- Henry Hall
- Naval Cfficer [Ch. 1]
- George 'Gabby' Hayes
- Doctor - Dirigible Passenger [Ch. 1]
- Harry Holman
- Maitland--Circus Owner [Ch.1]
- Lloyd Ingraham
- Dirigible Capt. Bannister [Ch.1]
- Crauford Kent
- Prof. Livingston - Explorer [Chs. 2-3]
- Frank Lanning
- The Wild Man
- Wilfred Lucas
- Circus Ring Announcer [Ch. 1]
- Bruce Mitchell
- Admiral [Ch. 1]
- Mickey Rentschler
- Boy at Circus
- Mickey Rooney
- Mickey--Lead Boy at Circus [Ch.1]
- Lloyd Whitlock
- Howard (Dirigible Officer) [Ch.1]
- Charles Williams
- Cub Reporter
