After three years on the run, Jim Guthrie returns with the scar of a rope burn on his neck. In a flashback, we learn how he was framed for murder but then escaped from the lynch mob just as he was about to be hung. Tired of running, he has returned to find the real killer and the Sheriff has given him just three hours to do it.

Mine owner William Sharon keeps having his gold shipments held up by a gang of bandits. Sharon hires banker Charles Crocker, who happens to have connections in the Central Pacific Railroad, to build a spur line from Virginia City to Carson City, so that the gold can be shipped by railroad. Silent Jeff Kincaid is the railroad engineer. However there is opposition to the railroad, chiefly from another mine owner, Big Jack Davis.

A technician brings a frozen specimen of the original Blob back from the North Pole. When his wife accidentally defrosts the thing, it terrorizes the populace-- the local hippies, cops, drunks and bowlers must all face the Blob!

Danny and Elliot avoid military service by pretending to be gay, but they have to act the part when the recruiting officer doesn't buy it.