After Percy, takes Diesel 10 to the Sodor Steamworks with the other diesels, Sidney had been left behind, It is unknown if he survived from the fire, it is likely that Den and Dart helped him out of building before the fire at the Dieselworks. He later received a new set of wheels from Percy and Thomas; and he was back on track again.
- Season 11: Holly Jolly Molly (not named) and Trembling Trevor (not named)
- Season 12: Sidney the Renegade and Vicarstown Takedown
- Season 13: Duck and the Quack Attack (cameo), Bert's Arlesdale Fail (cameo) and Sam I Am
- Season 14: Millie's Castle Hassle (cameo), Freddie at the Ready (cameo), Hiro and the Heat Wave (cameo) and Dirty ‘Arry
- Season 15: Philip Finds a Friend (cameo)
- Sidney never received a proper introduction in Keekre24's series. And he only appeared less than a minute in Sodor's Last Stand.
- Although he appeared for less than a minute in Sodor's Last Stand, he made a cameo in the trailer for the movie, Claw of the Law. It is known he will appear.