Prof. Millard pretends to be dead and helps Jeff King ferret out Vulcan, the evil traitor at the science academy. Donning his Rocket Man costume King goes from one hair raising rescue to the next in order to keep the newly invented Decimator out of the clutches of Vulcan and his minions.
Tris Coffin
as Jeff King
Mae Clarke
as Glenda Thomas
Don Haggerty
as Tony Dirken
James Craven
as Prof. Millard
I. Stanford Jolley
as Prof. Bryant
House Peters Jr.
as Burt Winslow
Douglas Evans
as Chairman
Ted Adams
as Martin Conway
Stanley Price
as Gunther Von Strum
Dale Van Sickel
as Martin/Professor Drake/Gates
Tom Steele
as Knox/Taxi Driver
David Sharpe
as Blears/Cliff/Stark
