Thomas & Friends: Season 20, Episode 4

20 - 4: Diesel and the Ducklings

Diesel struggles to maintain his rough demeanour after he finds some ducklings. Thomas comes across this and blackmails him to behave by threatening to tell 'Arry and Bert about Diesel's ducklings. Diesel tries to be kind, but he becomes split between being threatened by Thomas and looking tough in front of 'Arry and Bert.