The engines are hard at work to build the new Sodor Search and Rescue Centre. When Thomas helps a friend in need, he is rewarded with an exciting trip to the Mainland. Along the way, he gets lost at sea and finds himself on the mysterious Misty Island, where he meets new friends Bash, Dash, and Ferdinand. Together they try to help Thomas find his way home. Will Sir Topham Hatt's search party ever find Thomas? Find out in this action-packed movie adventure the whole family will enjoy!