The magical island of Sodor, the railway land of talking trains and vehicles, was once a realm of magic and innocence. but when the Fat Director of Sodor leaves for a holiday with is family, a force of evil diesels of the dark side arrive at the island of Sodor to cause great danger and peril to the engines and trains, and threatens to kill the engines and trains and find the magical secrets of Sodor to take over and rule Sodor forever. the world's greatest train, Thomas The Tank Engine along with his friends must go on a magical fantasy adventure quest to go and save Sodor from the evil diesels and find the magical secrets to restore the magic, solve the mysteries and save Sodor. Thomas soon learns that though he is still a small engine, he is capable of doing big heroic things.