Don't Tell Thomas

"Is that part of the surprise?" "That's for me to know and you to find out."

- Thomas and Emily

Don't Tell Thomas is the ninth episode of the eighth season.

Plot
The engines plan a surprise party for Thomas to thank him for his work clearing the lines of snow, but they keep the details away from Thomas, who is naturally furious they are not letting him in on the secret. Thomas eventually goes to sulk in a siding, but Harold convinces him to go to Wellsworth, where Thomas discovers a Christmas party is being held especially for him.

Characters

 * Thomas
 * Edward
 * Henry
 * James
 * Percy
 * Emily
 * Harold
 * Toby (does not speak)
 * Gordon (cameo)
 * Annie and Clarabel (cameo)

Locations

 * Tidmouth Sheds
 * Dryaw
 * Wellsworth
 * Maithwaite
 * Sodor River Bridge
 * Mountain Village

Trivia

 * The Dutch title of this episode is "Thomas May Not Know". In Denmark, the title is "Surprise". In Germany, the title is "Thomas Bursting With Curiosity". In Japan, it is called "The Secret to Thomas". The Polish title is, "Do Not Say Thomas". It is called "A Jolly Mystery" in Gaelic.

Goofs

 * In one shot at the sheds when the engines are discussing Thomas' surprise, Thomas can be seen next to Percy.
 * When the camera turns above Annie and Clarabel, its shadow can be seen.
 * In the US narration, the term "trucks" is used once.