When trouble strikes at the Blue Mountain Quarry, Thomas is sent to help his Narrow Gauge engine friends. While shunting and hauling, he catches a glimpse of a small engine trying to hide, yet no one will provide any clues to the engine's identity. Thomas is determined to get to the bottom of the mystery but discovering the truth is harder than he imagined! Will Thomas be able to save his new friend? Or will the mysterious engine be sent away from Sodor forever? Travel on an exciting journey with Thomas and his friends in his biggest movie ever, tracking down clues, discovering lost engines, and revealing the power of friendship!
In this magical tale, two children, Nellie and George, are sent to stay at a country house while their parents are moving. While exploring the local forest, George mysteriously disappears into Faery Land. With the help of a friendly hobgoblin named Broom, Nellie eventually finds George playing with faeries. Since he has just eaten some of their food, he is bound by faerie law to remain in Faery Land forever. Nellie agrees to complete three tasks in return for her brother's freedom.