The third in series of classic Fleischer Superman cartoons, Billion Dollar Limited starts with heavily armed guards keeping watch as a billion dollars of gold is loaded onto a train, to be taken to the mint. Clark Kent is also at the station, bidding farewell to fellow reporter Lois Lane, who has won the prize of accompanying the train to its destination and writing a story about the trip. As Kent leaves, he is almost swideswiped by a strange looking car. Inside the car is a gang of masked thugs, intent on getting that gold for themselves. In their technologically advanced car, they are capable of catching up with the train, and several sneak on board. They quickly turn loose the car that contains most of the guards, then climb over the train cars to the engine and seek to gain control of it. Lois, hearing noises, travels to the engine, just after the engineer and his assailant fall from the car. Lois grabs a machine gun left behind by one of the crooks and opens fire on the still-pursuing car, then tries to control the train, with little success. Kent, reading over the wire about the danger to the train, changes into Superman and flies off to the rescue. He saves the train from being diverted into a carload of TNT and rescues it as it falls off of a bridge dynamited by the gangsters. Although he almost succumbs to a tremendous load of tear gas, he finds the strength to overcome the villains and deliver the train to its final destination.