The town of Sodor is in for a big surprise when Thomas, everyone's favorite anthropomorphic tank engine, makes an inadvertent discovery that just might change everybody's lives forever. After he gets lost in the mountains in an attempt to help prepare for the annual town holiday celebration, Thomas uncovers the lost village of Great Waterton. As if there wasn't already enough excitement coursing through Sodor, the town is soon abuzz about not only their own anniversary and the addition of a new-found neighboring burg, but a new tank engine friend named Stanley! Pierce Brosnan provides his charming Irish lilt as the narrator of this fun feature-length entry to the beloved Thomas the Tank Engine canon that has been around in various forms since 1946.