Klagg, an alien who visits Earth, becomes so upset upon learning humanity still wages war that he declares war upon the nations of the Earth. The hero of the story convinces communist agents to pool their forces with the democracies in an effort to present a united front against Klagg. The effort is successful because the fact the various nations were able to set aside their differences and band together convinces Klagg to give up his campaign of destruction and leave Earth.
Albert Poole is a timid but brilliant scientist who is taken advantage of at work by his scheming boss, Harry Brown. Brown takes credit for Poole's inventions, but Poole has had enough. He builds a time machine and confronts Brown, demanding his name on the patent and a 20% royalty. Brown decides to steal the time machine and locks himself in the room. Poole attempts to open the door and stop him, because his boss does not know how the machine works. Brown activates the machine but is not sure how to set them for a specific year. He clicks random buttons, and, just as Poole bursts into the room, the time machine activates and disappears. To his dismay, Brown finds himself at the dawn of time, confronted by an enormous dinosaur. Fleeing for his life, Brown is attacked by cave men, and he races back to the time machine to escape. Unfortunately for him, however, there is no electricity, so he is trapped until someone can rescue him.
