The No. 6 engine on the North Western Railway, he is a cheeky litttle engine who works on the Ffarquhar Branchline, often pulling the mail. He enjoys playing tricks and teasing the other engines, though this does get him in trouble sometimes.
- Season 1: Stepney's Problem, A Scottish Tale, Toby and the New Engine, Duties of the Diesels (cameo), Wilbert to the Rescue, Wilbert and Tiger Moth (cameo), Frank and the Trucks and Gordon Plays a Trick
- Season 2: Daisy and the Visitor (cameo), James' Tender Trouble, A Flying Surprise (does not speak), Twin Trouble (cameo), Old Slow Coach (mentioned), The Flying Scotsman Returns, Save Sir Topham Hatt!
- Season 3:
- Season 4: Rosie's Wild Ride
- Season 5:
- Season 6: Percy's World Record
- Season 7:
- Season 8:
- Season 9: Tender Bender.
- Season 10: Bee Yourself, James, Mike Goes on Strike, Coal Crisis (cameo), and Groundhog Gordon.
- Season 11: Big City Rumor, Duncan in the Dumps (cameo), Just Duck's Luck, Spencer Goes Too Far and Holly Jolly Molly.
- Season 12: Percy Gets a Promotion, Henry's Handcar Havoc (mentioned), Bulgy Takes the High Road.
- Season 13: It's Good To Be Belle (cameo), Victor's Loco Motives, Who Stole The Coal?, Ivo Hugh's Day at the Zoo (cameo), Hector and Logan's Hot Pursuit and How Gator Stole Christmas (cameo).
- Season 14: Double-Decker-Wrecker (cameo), Hiro and the Heat Wave, Furious George.
- Season 15: For Whom The Belle Tolls, The Island of Misfit Engines.
- Season 16: Henry's Hill, Marion Had a Little Lamb (cameo), Painting the Rosie's Red