Olive is merrily preparing for Christmas when suddenly she realizes "Olive... the other Reindeer... I thought I was a dog. Hmmm, I must be a Reindeer!" So she quickly hops aboard the polar express and heads to the North Pole.
Before Jack and Annie can find out, the mysterious tree house whisks them to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark…or will they become a dinosaur’s dinner?