Jack and Annie have to find a certain kind of food, the fourth thing needed to save Merlin's penguin, Penny. The magic tree house whisks them off to a village in the mountains of China, close to a panda reserve. They don't know it, but they've arrived on the day of a historic earthquake! How will they survive when the giant quake strikes? Will they be able to rescue the pandas? And how will they ever get back to the tree house so that they can fulfill...

Jack and Annie travel back to Victorian London when Merlin asks them to use their magic to inspire Charles Dickens to write "A Christmas Carol."

When a mysterious note invites them to Camelot, Jack and Annie travel in the magic tree house to the magical kingdom where they must find a lost dragon.

Jack and Annie travel to a monastery in the Swiss Alps where, with the help of St. Bernard dogs and magic, they seek the second of four special objects necessary to break the spell on the wizard Merlin's beloved penguin, Penny.

The magic tree house is back with a message from Morgan le Fay telling Jack and Annie to seek out "The Gray Ghost" and listen to her story, and immediately they are whisked away to Nepal where they meet Tenzin, a climber who has recently lost his family, and who takes them up the mountain to meet a snow leopard and renew himself