 He soon outfits another member, Jeff King (Tristram Coffin) with an advanced, atomic-powered rocket backpack, attached to leather jacket with a bullet-shaped, aerodynamic flight helmet, and a raygun that they had been developing together.Using the flying jacket and helmet and other inventions provided by Dr. Millard, and aided by magazine reporter and photographer Glenda Thomas (Mae Clarke), Jeff King, as Rocket Man, battles Vulcan and his henchmen through a dozen action-packed Republic serial chapters.Eventually, Vulcan steals Millard's most dangerous invention, a Sonic Decimator, and uses it to flood, then destroy New York City.