When trouble strikes at the Blue Mountain Quarry, Thomas is sent to help his Narrow Gauge engine friends. While shunting and hauling, he catches a glimpse of a small engine trying to hide, yet no one will provide any clues to the engine's identity. Thomas is determined to get to the bottom of the mystery but discovering the truth is harder than he imagined! Will Thomas be able to save his new friend? Or will the mysterious engine be sent away from Sodor forever? Travel on an exciting journey with Thomas and his friends in his biggest movie ever, tracking down clues, discovering lost engines, and revealing the power of friendship!
Michael Angelis
as Narrator (voice)
Ben Small
as Thomas (voice) / Toby (voice) / Rheneas (voice) / Owen (voice)
Keith Wickham
as Various characters (voice)
Matt Wilkinson
as Various characters (voice)
Steven Kynman
as Paxton (voice) / Peter Sam (voice)
Michael Legge
as Luke (voice)
David Bedella
as Victor (voice) / The Cuban Dock Workers (voice)
Kerry Shale
as Diesel (voice)
Martin Sherman
as Thomas / Percy (voice)
William Hope
as Edward / Toby / Rocky (voice)
Jules de Jongh
as Emily / Mavis (voice)
Glenn Wrage
as Cranky (voice)
