Diesel's Devious Deed - US/Dirty Work - UK is the thirteenth episode ever made in Season 2.
Diesel, the newest engine on the Island of Sodor, is having a hard time having been made to look silly in front of the trucks, who delight in teasing him. Duck decides that Diesel has gone through enough and stops the trucks from their joking. Diesel is cross and accuses Duck of making the trucks laugh at him. Gordon, James, and Henry are nearby and tell Diesel that Duck would never do that. While engines may have falling out, they would never tell lies to the trucks.
By now, Diesel's dislike of Duck has grown to such a point that he wants him to be sent away and, inspired by the engine's words about trucks, makes a plan. Going into the yard one day, Diesel tells the trucks some jokes about the bigger engines and claims that he heard them from Duck before leaving. The trucks find these jokes hilarious and quickly repeat them to the bigger engines, as well as telling them that they came from Duck in order to get revenge on him for forcing them to behave.
Gordon, James, and Henry hold a meeting and agree that Duck needs to be paid back for teasing them. Later, Duck returns to the shed after an extremely hard day's work. However, when he tries to get back inside for a rest, the bigger engines instead blow steam at him. They tell him that, after telling tales about them to the trucks, they no longer trust him and want Diesel to replace him. Duck denies this and an argument begins.
The Fat Controller arrives to see what the commotion is and is told of the bigger engines accusation against Duck. The Fat Controller gives Duck a chance to explain himself and Duck tells the Fat Controller that his only wish at this point is that he had thought of those jokes. Diesel comes forward and when the Fat Controller asks him what he knows, Diesel feigns shock at Duck's actions, but claims ignorance otherwise.
The Fat Controller sends Duck to work with Edward in Wellsworth while he tries to get to the bottom of the incident. Thinking the Fat Controller has turned against him too, Duck obeys his orders. Diesel smirks, happy with his victory.
- The truck Duck bumps appears to be pulled by string.