A cattle buyer, a federal agent and a newswoman snip a railroad plot.

Columbia Pictures elevated stunt man Jock O'Mahoney to stardom in this 15 chapter western serial about the building of the transcontinental railroad. O'Mahoney played a railroad agent who uncovers the master criminal behind a series of sabotage attempts on the construction site.

Buffalo Bill Cody battles a gang of outlaws secretly headed by an unscrupulous lawyer.

A ranger in Buffalo Gap has been killed and the trail leads to a gang headed by Bill Judd. When there is yet another killing, the sheriff seems remarkably hesitant to arrest the culprit and may be taking his orders from a mystery boss. Teaming up with Al's pretty sister and her Uncle Bob, Cheyenne and Fuzzy go in search of the mystery villain.

Ex-con Joseph Braden has his car temporarily stolen by a pair of bank robbers who hide their loot in the vehicle's spare tire. After the car is repossessed, it's sold to the kindly Rev. Daniel Sheridan, who immediately sets out on a fishing trip. Not knowing that his new automobile was recently used in a heist, Father Dan gets the surprise of his life when he's suddenly stopped by a police officer.

Accountant Augustis King discovers that his wife, Marfhe, is having an affair with his boss Sam Bellows. He telephones Internal Revenue Bureau that he can give evidence of a large tax-evasion racket. Before IRS-agent Steve Daniels arrives, King is murdered by a henchman of Bellows and his partner, Ernie Medford. Daniels discovers that Bellows and Medford are smuggling gold bullion from their mine in Mexico, and sell and bank the money under assumed names. they hide the bullion in a compartment welded to the bottom of a car.

"The Adventures of Sir Galahad" is the 41st serial released in 1949 by Columbia Pictures. It was was based on Arthurian myth and legend. Galahad is tasked with guarding Excalibur over night to prove he is worthy to become a Knight of the Round Table. When the sword is stolen, he must search the land to reclaim Excalibur and restore his owner.