Season 4

Foghorn, a pirate who lives in the water by the Rich's underwater city, tries to steal a control box that would destroy the city so he can search for buried treasure. / The devious Collector hatches an ingenious plot to bankrupt the Rich Family and take over their estate.

Shaker, the Earthquakes Maker threatens to destroy a famous landmark if Richie fails to unravel three clues leading to his destination. / The Abominable Snowman creates a machine that changes the earth's climates into ice and snow.

Irona is reprogrammed by the Collector to steal from the Rich vaults. / Mayda acts the pest when she follows Richie to Kodapur and steals the island ruler's giant diamond.

Richie, with the help of his friends, must defeat a robotic villain named Computo who is planning to crash all of the video games and computers around the world.