Originally Aired: June 5, 1960

Gunsmoke #426, "Fabulous Silver Extender," finds Chester holding down the fort while Matt Dillon transports a prisoner to Have City. Into the marshal's absence walks the nervous Professor Albert Cramston, a self-proclaimed metallurgical researcher who claims the San Francisco silver syndicate has put a price on his head. Eight hired killers are supposedly tracking him down for ten thousand dollars, though he can't identify any of them. Chester promises to keep watch, but the real mystery begins when local shopkeepers Wilbert and Durgum notice the peculiar professor borrowing dimes at the Long Branch saloon, then mysteriously returning with silver dollars to repay them.

Following Cramston to Wilbert's recently sold shop, the curious pair discovers him working with strange machinery by lantern light. When they attempt to apprehend him as suspicious, Chester intervenes, forcing an uneasy introduction between the frightened professor and the would-be captors. Cramston, satisfied they aren't foreign agents or syndicate killers, prepares to reveal his closely guarded secret to the three men, provided they're willing to die to protect it for the good of their country.