Based on the comics series credited to Zane Grey, this action-packed serial stars Allan Lane as Royal Canadian Mounted Police officer Sgt. Dave King. Can King and the rest of his Mountie brethren stop a gang of spies from stealing "Compound X," a priceless magnetic mineral they plan to use to wage war on England? Robert Strange, Robert Kellard, Lita Conway also star. 12 episodes; 3 1/2 hrs. Standard; Soundtrack: English.