When a mischievous little racing car called Ace passes through Sodor on his way around the world, Thomas is inspired to embark on an ambitious trip. Traveling full steam ahead across five continents, Thomas discovers magnificent new sights and experiences exciting places and cultures. He makes friends with an inspiring and fun Kenyan engine called Nia. With so much for Thomas to learn about the world, will Nia be successful in teaching him a lesson about the true meaning of friendship?