12x1 – Episode 1
A photographer arrives to photograph the engines for a billboard. However, Diesel accidentally blocks Thomas.
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12x2 – Episode 2
Edward has to deliver a waterwheel to the waterworks at Great Waterton. He ignores advice and takes the waterwheel on the bumpy tracks where he thinks more people will be able to see the magnificent wheel.
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12x3 – Episode 3
The funfair has arrived on Sodor and Rosie is hoping gets the job of delivering it. Instead The Fat Controller asks Emily. Disappointed, Rosie decides that she can 'help' Emily, who has a lot of other jobs, by taking the funfair alone.
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12x4 – Episode 4
Peter Sam stumbles across a statue of legendary engines, Proteus, which he attempts to keep secret from the other engines.
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12x5 – Episode 5
Henry tries to save the wishing tree, but he doesn't realise that the specialist woodsmen want to save the tree, not chop it down.
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12x6 – Episode 6
Thomas refuses to accept help from the big, new American engine called Hank, but soon runs into trouble.
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12x7 – Episode 7
Toby becomes determined to find something special on the island, just like his friends, so that The Fat Controller will think that he too is special. But Toby spends so much time searching for something special that he runs out of coal.
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12x8 – Episode 8
Emily is declared "excellent" by The Fat Controller and it goes straight to her head. When she is given an important job to do, she comes across a series of tricky situations, and finds herself up to her buffers in sticky mud.
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12x9 – Episode 9
Freddie takes it upon himself to move the children's winter holiday party to the wharf so that Colin the Crane can be included in the fun.
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12x10 – Episode 10
When a Sodor fireman is to be presented with a medal for bravery, Thomas decides to be a hero too. He tries to prove himself but causes havoc and disaster wherever he goes.
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12x11 – Episode 11
It's the Percival twins' birthday and Mr Percival has got them a Hot Air Balloon ride as a treat. When Duncan learns this, he is upset as he already has his birthday flag fixed on his cab ready to take the twins for a special birthday ride.
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12x12 – Episode 12
James refuses to take Hector's advice and gets his train stuck in a snow drift.
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12x13 – Episode 13
It is the first Great Waterton Festival and Toby is to lead the parade. Thomas is delighted for his friend. When The Fat Controller introduces Thomas to Flora, a new steam tram, and tells them that she is to lead the parade with Toby, Thomas is worried.
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12x14 – Episode 14
Thomas and Diesel cause havoc at the quarry by racing backwards.
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12x15 – Episode 15
Gordon is a very proud engine and thinks he knows the Sodor railway better than any other engine. When taking a short cut in order to get to the docks first, he gets lost and won't ask for directions from the other engines.
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12x16 – Episode 16
Thomas tries to find the "Man in the Hills" on the day of Mr. Percival's birthday.
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12x17 – Episode 17
Thomas has been given the job of delivering specially made blocks for the rebuilding of the Sodor River Bridge. When his brakes start to fail, his friends offer to help. However, Thomas is too proud to accept!
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12x18 – Episode 18
Percy is instructed by The Fat Controller to take Lady Hatt to her surprise party. However, when Percy tells her he is taking her on a special trip, she tells Percy where she wants to go.
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12x19 – Episode 19
Skarloey causes havoc while delivering a puppet show special after refusing help from his best friend, Rheneas.
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12x20 – Episode 20
When Thomas is given the job of pulling a brass band, a job his best friend Percy wants, Thomas decides to keep it secret.
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