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".

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.

Billy "The Kid" Bonney is a hot-headed gunslinger who postpones his life of crime when he is befriended and hired by peaceful cattle rancher Eric Keating. When Keating is killed by a rival, Billy seeks revenge, even if it means opposing his old friend, Marshal Jim Sherwood.

When his family is killed by Indians, a bitter cowboy turns into a ruthless hired gunman. Unbeknownst to him, his son had survived the attack, and is now a lawman. The son, not knowing that the killer is his father, is assigned to bring him to justice.