Their magic tree house takes Jack and Annie to the Arctic, where a polar bear leads them onto very thin ice.

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.

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.

"With ladders, swings, turrets, and elaborate pulley systems everywhere--animals chase one another over, under, around, and through the tree house that Jack has built. Then the bell rings, and all the animals gather for story time with Jack"--

Jack and Annie travel back to nineteenth-century Ireland to inspire a young Augusta Gregory to share her love of Irish legends and folktales with the world.

Pete invites his friends over, but when he finds that his tree house is not big enough for everyone, they work together to build a fun place that can house everyone.

Jack and Annie experience a series of time-travel adventures.

It's a treasure trove of trouble! Jack and Annie are in for a high-seas adventure when the magic tree house whisks them back to the days of deserted islands, secret maps--and ruthless pirates! Will they discover a buried treasure? Or will they be forced to walk the plank? The magic treehouse whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.

Andy and Terry travel through time trying to save their treehouse from highly talented, angry ants and Inspector Bubblewrap the building inspector while rushing to meet their publisher's deadline.