|April Fools' Day|
|Air date||April 11, 2013|
|Thomas & Stepney||Devious Diesel 10|
Bill and Ben are in the yard until BoCo tells them that not to play pranks on anyone because April Fool's Day tomorrow. then Bill and Ben get the idea of playing a trick on Gordon however the episode now becomes a parody of Percy runs away. they won't tell Gordon cause he can't stop because he slides on the tracks and crashes into Percy and then his passengers died and even the signalman and Bill and Ben realize they have killed people.