An UnbeLEAFable Day

"So, are you still missing summer?" "Nope. You've showed me how great fall is: playing in the leaves, the colours, all the happy people. It's been an unbelievable day!" "I think you mean an unbeleafable day!"

- Percy and Thomas

An UnbeLEAFable Day is the forty-first episode of the first series of Thomas & Friends: All Engines Go.

Plot
While the engines are setting up for the Fall Festival, Thomas is feeling down about the end of summer and the changing weather.

Characters

 * Thomas
 * Gordon
 * Percy
 * Nia
 * Diesel
 * Kana
 * Carly
 * Sandy
 * Annie and Clarabel
 * Sir Topham Hat

Locations

 * The Dark Woods
 * Crovan's Creek
 * Knapford
 * Whistling Woods
 * Suddery
 * McColl Farm
 * Tidmouth Sheds
 * Vicarstown

UK

 * Aaron Barashi as Thomas
 * Will Harrison-Wallace as Gordon
 * Henri Charles as Percy
 * Sade Smith as Nia
 * Henry Harrison as Diesel
 * Chloe Raphael as Kana
 * Eva Mohamed as Carly
 * Holly Dixon as Sandy
 * Wendy Patterson as Annie and Clarabel
 * Tom Dussek as Sir Topham Hatt

US and CAN

 * Meesha Contreras as Thomas
 * Neil Crone as Gordon
 * Charlie Zeltzer as Percy
 * Talia Evans as Nia
 * Shomoy James Mitchell as Diesel
 * Ava Ro as Kana
 * Jenna Warren as Carly
 * Glee Dango as Sandy
 * Catherine Disher as Annie
 * Linda Kash as Clarabel
 * Bruce Dow as Sir Topham Hatt

Song

 * Fall Fun

Trivia

 * Going by production order, this is the forty-second episode of the first season.
 * Thomas being disappointed about summer ending is similar to the 2001 book, Thomas Tells a Lie.
 * Vicarstown was originally supposed to appear, but was dropped for unknown reasons.
 * This is the first episode where Wendy Patterson voices Annie and Clarabel and Tom Dussek voices Sir Topham Hatt in the UK dub.
 * This is the only episode in the first series to be written by Ghia Godfree.

Goofs

 * Annie and Clarabel consistently swap places throughout the first minute and a half of the episode.
 * Clarabel has Annie's ornate pattern, and is also missing her freckles in one scene.
 * When Thomas, Percy and Kana arrive at Knapford, Annie's face is missing.
 * In one scene in a top view, the grey on Gordon's footplate is missing.
 * In a scene where Diesel says the Fall festival is saved, Gordon's tender is missing.
 * Annie and Clarabel's voices are swapped when the hay rides begin.
 * On the RTÉ Player, the episode image was of the episode Gordon Gets the Giggles, and the '2521a' was beside the episode title.