Yakko Warner sings a song that explains time and time zones. He introduces the International Date Line and illustrates the idea through real-world examples.
Beakman explains how they make underwater tunnels using a fish tank with gravel in the bottom. He then puts a hamster tunnel in it to show how the hamster could get from one side to the other without getting wet. They then show a clip of how the Chunnel was made between England and France.
Bart and Gina visit a blacksmith to get their handcuffs removed. The blacksmith creates a key by heating up metal, shaping it in the desired manner, and then cooling it.