Eight-year-old Jack and his younger sister Annie use the magic tree house to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
The magic tree house transports Jack and Annie back in time to the ice age where they encounter prehistoric men, cave bears, sabertooth tigers, and woolly mammoths.
The magic treehouse takes Jack and Annie to a moon base in the future, where they continue to search for the fourth thing they need to free their friend Morgan from the magician's spell.
