Feature version of the 1949 serial, KING OF THE ROCKETMEN: Young member of scientific group uses new rocket-powered flying suit to thwart shadowy saboteur known only as "Dr. Vulcan".
| Actor | Role |
|---|---|
 Tristram CoffinProf. Jeff King | Prof. Jeff King |
 Mae ClarkeGlenda Thomas | Glenda Thomas |
 Don HaggertyTony Dirken | Tony Dirken |
 House Peters Jr.Burt Winslow | Burt Winslow |
 James CravenProf. Millard | Prof. Millard |
 I. Stanford JolleyProf. Bryant | Prof. Bryant |
 Ted AdamsMartin Conway | Martin Conway |
 Marshall BradfordDr. Graffner | Dr. Graffner |
 Stanley PriceGunther von Strum | Gunther von Strum |
 Douglas EvansCivil Defense Chairman | Civil Defense Chairman |
| AArvon DaleChairman's Aide | Chairman's Aide |
| TTom SteeleHenchman | Henchman |
 Dale Van SickelHenchman | Henchman |
 David SharpeHenchman | Henchman |
 Carey LoftinHenchman | Henchman |
| BBud WolfeHenchman | Henchman |
 Frank O'ConnorOld Watchman | Old Watchman |
 Art GilmoreRadio Voice | Radio Voice |