As in other Republic serials, Republic's top stuntmen, Dale Van Sickel, Tom Steele and David Sharpe, not only did stunts for other actors, they were given multiple roles throughout the serial. The audience were meant to see only one episode per week and therefore not expected to remember the faces of each henchman or extra.
Jeff King's atomic powered rocket suit was so advanced that it required only three operational controls: on/off, up/down and slow/fast.
The footage from the final chapter showing the destruction of New York City was taken from Deluge.
This was another of Republic's titles to use a play-on-words for "King of..." "King" was actually the name of the main character.
Titles of Chapters
- 1. Dr. Vulcan. Traitor
- 2. Plunging Death
- 3. Dangerous Evidence
- 4. High Peril
- 5. Fatal Dive
- 6. Mystery of The Rocket Man
- 7. Molten Menace
- 8. Suicide Flight
- 9. Ten Seconds To Live
- 10. The Deadly Fog
- 11. Secret of Dr. Vulcan
- 12. Wave of Disaster Note: The On Screen number to this is 'Last Chapter' instead of '12'