Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
Jack and his younger sister take a trip in their tree house back to ancient Egypt. They find themselves in a pyramid's maze and need to find their way out before they become mummies themselves.
The magic tree house transports Jack and Annie on a mission to the Ice Age where they encounter Cro-Magnons, cave bears, sabertooth tigers, and woolly mammoths.