The Alexandthomas Christmas Special (2012) is a 4 part (5 part, including the credits) special released on December 23, 2012 and December 25, 2012.
With the arrival of Christmas to The Sodor Colony, the citizens and engines become excited. New lights are laid around the railway, and Christmas trees are put up. Gordon is the only one who is not excited, as his express is often late and he has to make up for lost time.
Gordon grouches around the railway, and the others wonder why. Edwatd hypothesizes he might be stressed because of his express. The following day, Henry has to leave for the mainland by a hidden rail connection to get supplies for The Sodor Sturdy. As he travels throughout, the others wonder where he is, considering they hadn't seen him leave. Gordon worries most of all, as Henry was the main victim of his ranting.
Along the way, Henry notices several oddities, like a scrapyard in the middle of nowhere, a column collapsing in the middle of the night, and an old abandoned shed next to the line. But he forgets these things as the excitement of London approaches him.
When Henry returns, everyone is excited, but The Fat Controller notices he can't hide the rails again. This is because Diesel 10 was in the abandoned shed and used the line to hijack The Sodor Colony. When Diesel 10 arrives, he takes Henry and himself up to The Sodor Sturdy in Knapford Station, where the two battle until Henry shunts the diesel off the tower and onto a bridge. There, Sir Topham Hatt threatens Diesel 10 to return everything to normal.
Afterwards, everyone celebrates Henry's return and Christmas, ending the special.
The Christmas Special is the first to feature a Sodor Colony attempt at scenary, brought through Henry's journey through the snow. The sets were easy to disassemble and were quickly made to seem like different areas of the mainland connection. The Sodor Colony was decked out with Christmas lighhts, snow covered trees, and an artificial layer of snow (a.k.a. white t-shirts) around Knapford Station. The purpose was to lighten up the area and give it a Christmas feeling, considering last year's Christmas Special didn't.
The special itself is divided up into five parts, part 1 being called "The Beginning of a Christmas Adventure", 2 being "The Journey and the Wait", 3 being "Christmas Stress, Worry, and Confusion", 4 being "The End of a Christmas Adventure", and 5 being the credits. This is the first Alexandthomas Special to have named parts.