 A slightly revised remake of 1933 s "Trouble Busters" (the villains now are enemy agents rather than land grabbers) that finds Ken Baxter (Ken Maynard) and his two pals, Pancho (Julian Rivero) and Panhandle (Ralph Peters), finding Professor Wahl (Michael Vallon), injured and wandering on the range. They take him to Blue Mesa Trading Post, where two archeologists, Dr. Floto (William Costello as William Castello) and Baron Starkoff (Sven Hugo Borg), foreign government representatives, are staying. Both want to secure control of a supply of helium gas found in an ancient Indian cave. Wahl, working for the Federal Government, is murder at the Blue Mesa. The land strip on which the cave is located is claimed by Letty (Fay McKenzie) and Jim Morgan (Julian Madison), brother and sister owners of the Lazy Y Ranch. Tin Cup Ranch owner Joe Larkin (Charles King) hires Ken to take possession of a cabin on the Morgan land in order to gain title. Ken, an undercover G-Man, discovers a secret passageway from the cabin that leads to the cave and discovers the helium, and also that Larkin is working with Starkoff.