Episodes
Episode: 12x01 | Airdate: Sep 1, 2008 (7 min)
When a photographer comes to photograph the engines for a billboard Diesel accidentally obscures Thomas. Believing that Diesel did it on purpose, Thomas deliberately avoids him when he accidentally loses the billboard and has to get another arranged.
Episode: 12x02 | Airdate: Sep 2, 2008 (7 min)
Edward takes the Great Waterton water wheel on the scenic route to show off to his friends.
Episode: 12x03 | Airdate: Sep 3, 2008 (7 min)
Rosie and Emily are pulling a train for a fair, but Rosie wants to pull it alone.
Episode: 12x04 | Airdate: Sep 4, 2008 (7 min)
Peter Sam rushes to finish his jobs in order to hear a tale about Proteus from the famous storyteller, Miss Marvel.
Episode: 12x05 | Airdate: Sep 5, 2008 (7 min)
Henry worries that the workmen are going to cut down the wishing tree.
Episode: 12x06 | Airdate: Sep 8, 2008 (7 min)
A large new engine called Hank arrives, but Thomas is determined not to need his help.
Episode: 12x07 | Airdate: Sep 9, 2008 (7 min)
Toby wants to make an impression by searching Sodor for something special.
Episode: 12x08 | Airdate: Sep 10, 2008 (7 min)
Emily becomes arrogant after receiving praise from the Fat Controller.
Episode: 12x09 | Airdate: Sep 11, 2008 (7 min)
Freddie decides to reorganise a winter party from Mr. Percival's house to the Wharf as a surprise for Colin the crane.
Episode: 12x10 | Airdate: Sep 12, 2008 (7 min)
Thomas wants to prove his heroism when he learns a fireman is to be honoured.
Episode: 12x11 | Airdate: Sep 15, 2008 (7 min)
Mr. Percival's twins are getting a ride in the Hot Air Balloon for their birthday, but Duncan wants to take them himself.
Episode: 12x12 | Airdate: Sep 16, 2008 (7 min)
When James ignores Hector's advice, he gets caught in bad winter weather.
Episode: 12x13 | Airdate: Sep 17, 2008 (7 min)
Toby and Flora are heading a parade at Great Waterton; Thomas thinks Toby would rather lead the event on his own and tries to distract Flora.
Episode: 12x14 | Airdate: Sep 18, 2008 (7 min)
Thomas and Diesel race backwards.
Episode: 12x15 | Airdate: Sep 19, 2008 (7 min)
Gordon gets lost while taking a shortcut and refuses to ask for help.
Episode: 12x16 | Airdate: Sep 22, 2008 (7 min)
Thomas and the narrow gauge engines collect presents for Mr. Percival's birthday.
Episode: 12x17 | Airdate: Sep 23, 2008 (7 min)
Thomas' brakes malfunction while delivering bricks to repair a bridge.
Episode: 12x18 | Airdate: Sep 24, 2008 (7 min)
Percy is tasked with bringing Lady Hatt to a surprise party - but the unknowing Lady Hatt tells him to go elsewhere.
Episode: 12x19 | Airdate: Sep 25, 2008 (7 min)
Skarloey refuses Rheneas' help to pull a train for a puppet show and ends up playing the trucks' games.
Episode: 12x20 | Airdate: Sep 26, 2008 (7 min)
Thomas tries to avoid telling Percy he has been given a job Percy wants to do.
Specials
Episode: S12 Special | Airdate: Oct 6, 2008 (60 min)