The third season of the television series aired in 1991. There were twenty-six episodes. Michael Angelis narrated all the UK episodes, with George Carlin narrating all the episodes in the US.
- A Scarf for Percy - Percy wants to wear a scarf, but changes his mind after an accident with a baggage trolley.
- Percy's Promise - Percy manages a promise to Thomas and despites a terrible storm manages to get Annie, Clarabel, and the Sunday school home safely.
- Time for Trouble - James takes over Gordon's work, but is humbled after having to push Toby to the Works.
- Gordon and the Famous Visitor - Gordon is jealous when a visitor arrives.
- Donald's Duck - Duck gets cross at Donald and plays a trick on him.
- Thomas Gets Bumped - Thomas is scared Bertie will take over his passenger traffic after he is sent to the yard.
- Thomas, Percy and the Dragon - Thomas gets even with Percy's ghostly prank with the help of a paper Chinese dragon.
- Diesel Does it Again - Diesel returns to cause trouble for Percy and Duck at the harbour.
- Henry's Forest - Henry is upset when a forest is decimated in a storm, but Toby puts things right.
- The Trouble with Mud - Gordon is given goods work after spraying James with mud, but helps him up his hill.
- No Jokes for James - James tricks Thomas into giving him Gordon's express, but soon regrets the trick.
- Thomas, Percy and the Mail Train/Thomas, Percy and the Post Train - Thomas and Percy try to save their post trains from being replaced by Harold.
- Trust Thomas - Thomas promises to help mend Bertie's roads, but must help himself first after Gordon and James get him into bother.
- Mavis - Mavis, a new Diesel, proves to be arrogant and troublesome.
- Toby's Tightrope - Mavis redeems herself after Toby nearly "walks a tightrope" when his trucks push him onto an unsafe bridge.
- Edward, Trevor and the Really Useful Party - Edward and Trevor help the vicar with a garden party, while Bertie runs into bother in the mud.
- James Goes Buzz Buzz/Buzz Buzz - James calls BoCo a "buzzbox", but becomes one himself after a beehive is broken by a porter.
- All at Sea - Duck wishes to travel to the horizon, but after helping an injured workman, he changes his mind.
- One Good Turn - Bill and Ben fall out over an incident with a turntable.
- Tender Engines - Henry boasts he deserves an extra tender for his hard work, but Duck brings him down to earth again.
- Escape - Douglas rescues a Great Western engine named Oliver from scrap.
- Oliver Owns Up - Oliver is boastful, but a group of grumpy coal trucks teach him a lesson.
- Bulgy - A rude bus attempts to steal Duck and Oliver's passengers.
- Heroes - Bill and Ben cause confusion at the harbour, but become heroes after saving workers during a rockslide at the quarry.
- Percy, James and the Fruitful Day - Percy and James have an adventure with a fruit train.
- Thomas and Percy's Mountain Adventure/Thomas and Percy's Christmas Adventure - Thomas and Percy work together to give a snowed-down village a Merry Christmas.