Réalisation: Rob Silvestri
Un invité spécial arrive sur Sodor avec un projet secret. Les locomotives rencontrent de nouveaux amis et trouvent des vestiges cachés. Ensuite, leur courage est mis à l'épreuve lorsque leur nouvel ami Stephen disparaît. Thomas le retrouvera-t-il à temps ? Les locomotives découvriront-elles la vérité sur le plus grand mystère de l'île de Sodor ?
Mark Moraghan
Narrator (voice)
Ben Small
Thomas / Toby / Rheneas / Troublesome Trucks (voice)
Keith Wickham
Edward / Henry / Gordon / James / Percy / Skarloey / The Fat Controller (voice)
Teresa Gallagher
Emily / Belle / Annie / Clarabel (voice)
Matt Wilkinson
Spencer / Cranky / Kevin (voice)
伊川東吾
Hiro (voice)
Bob Golding
Stephen (voice)
Jonathan Forbes
Connor (voice)
Rebecca O'Mara
Caitlin (voice)
Kerry Shale
Diesel (voice)
Steven Kynman
Paxton / Jack (voice)
David Bedella
Victor (voice)
Michael Legge
Luke (voice)
Miranda Raison
Millie (voice)
Mike Grady
Sir Robert Norramby (voice)
Mark Moraghan
Narrator (voice)
Ben Small
Thomas / Toby / Rheneas / Troublesome Trucks (voice)
Keith Wickham
Edward / Henry / Gordon / James / Percy / Skarloey / The Fat Controller (voice)
Teresa Gallagher
Emily / Belle / Annie / Clarabel (voice)
Matt Wilkinson
Spencer / Cranky / Kevin (voice)
伊川東吾
Hiro (voice)
Bob Golding
Stephen (voice)
Jonathan Forbes
Connor (voice)
Rebecca O'Mara
Caitlin (voice)
Kerry Shale
Diesel (voice)
Steven Kynman
Paxton / Jack (voice)
David Bedella
Victor (voice)
Michael Legge
Luke (voice)
Miranda Raison
Millie (voice)
Mike Grady
Sir Robert Norramby (voice)
Mark Moraghan
Narrator (voice)
Ben Small
Thomas / Toby / Rheneas / Troublesome Trucks (voice)
Keith Wickham
Edward / Henry / Gordon / James / Percy / Skarloey / The Fat Controller (voice)
Teresa Gallagher
Emily / Belle / Annie / Clarabel (voice)
Matt Wilkinson
Spencer / Cranky / Kevin (voice)
伊川東吾
Hiro (voice)
Bob Golding
Stephen (voice)
Jonathan Forbes
Connor (voice)
Rebecca O'Mara
Caitlin (voice)
Kerry Shale
Diesel (voice)
Steven Kynman
Paxton / Jack (voice)
David Bedella
Victor (voice)
Michael Legge
Luke (voice)
Miranda Raison
Millie (voice)
Mike Grady
Sir Robert Norramby (voice)