Thomas and Friends, The Mystery of Lookout Mountain

When cars go missing in the Mines, Thomas and Percy think they have a perfect adventure for the Biggest Adventure Club. But then they uncover that there was a similar problem at Lookout Mountain years ago. Thomas and friends set out to solve the two-headed mystery. Their search takes them under waterfalls, into unknown tunnels, new Crystal Caverns and ultimately brings the kids face to face with a mythical Mine Monster!