Spencer is a sleek tender engine. He is owned by the Duke and Duchess of Boxford. He is a silver engine that has his own coach to carry the Duke and Duchess of Boxford. And also pulls his own furniture car.
Unfortunately, Gordon is coming down the line and does not see the Troublesome Trucks and crashes into them. The trucks zoom away and now Spencer has learnt his lesson.
In Season 2, Spencer is ready for competition and challenges Gordon to a race leading disastrous results.
In Sodor's Last Stand he turns against the other steam engines and joins Diesel 10 but Diesel 10 later betrays him making it so neither the steam engines or the diesels like him.
Season 8: Sir Spencer of Sodor
season 12: Greetings, Montague! (mentioned).
Claw of the law
Lady • Wilbert • Bear • Stepney • Foreign Engine • Jinty • Sixty • Little Barcord • Spamcan and Bowler • Splatter and Dodge • Toby's Brothers • Bert and 'Arry • Billy • Flying Scotsman • The Old Engine • Spencer • City of Truro • Old Stuck-Up • Tigermoth • The Mainland Engines • Hiro • The Diesel Shunter • Green Arrow • Eagle