Government Agents vs Phantom Legion

Republic serial featuring our clean- cut, incredibly well-dressed heroes Sam and Hal who work for some unidentified GOVERNMENT AGENCY in pursuit of evil Cady and Regan, who are in the business of hijacking trucks for their VALUABLE DEFENSE MATERIALS cargoes and selling the cargoes to some FOREIGN COUNTRY. Cady and Regan, by the way, also wear nifty suits but can be distinguished from Sam and Hal by the darker hats and the borscht stains on their ties.

Great early '50s cars, and lots and lots of fistfights (usually on a moving platform or near imminently explosive materials) will keep your attention for an hour. After that, you may tire of the end-of-episode cliffhangers that are invariably resolved in a totally anticlimatic fashion: Hal jumped clear of the car, you see, so he REALLY didn't blow up with his Buick... Also the concept that the U.S. government couldn't pursue an espionage ring endangering national security with more than two guys armed with .38s.

But by watching this video you will certainly see the genesis of the Indiana Jones films made with a vastly higher budget and less circular plotting.