Excitement spreads across Sodor with the arrival of a new and unusual engine. Worrying they'll be replaced by the fast and modern Hugo; the engines fail to be good friends by not making him feel welcome. When they stop to listen, they realize that Hugo is a very special engine who truly belongs on the rails. Elsewhere things get spooky when the engines see a ghost train and Percy goes on a troll hunt. Skiff takes Sir Topham Hatt on a wild ride in...

For their summer vacation, twelve-year-old twins Dipper and Mabel Pines travel to the fictitious town of Gravity Falls, Oregon to spend the summer with their Great Uncle Stan Pines (often shortened to Grunkle Stan), who runs a tourist trap called the 'Mystery Shack'. Things are not what they seem in this small town, and with the help of a mysterious journal that Dipper finds in the forest, they begin unraveling the local mysteries.