Sonny is trying to prove himself to be a useful engine so that he can stay working on Sodor, but nobody seems to trust him... nobody apart from Diesel, that is! But can Diesel be trusted?

Mattel green-lit a new series and several specials for Thomas & Friends that will premiere in 2020 to celebrate the 75th anniversary of the franchise. Production will consist of 20 x 11-minute episodes as well as three 22-minute specials following the recent revamp of the series.

David Stoten was announced as the new head writer for the series, succeeding Andrew Brenner. This also marks the final series animated by Jam Filled Toronto.