The Mystery of Lookout Mountain

"Well, we rolled into a mystery, and made adventure history! That's why we're called the..." "Biggest Adventure Club!"

- Thomas, Gordon, Darcy and the Biggest Adventure Club The Mystery of Lookout Mountain is the second feature-length special for Thomas & Friends: All Engines Go.

Synopsis
When cars go missing in the Mines, Thomas and Percy think they have the perfect adventure for the Biggest Adventure Club. But then they uncover that there was a similar problem at Lookout Mountain years ago. Thomas and his friends set out to solve the two-headed mystery. Their search takes them under waterfalls, into unknown tunnels, new Crystal Caverns and ultimately brings the kids face to face with a mythical Mine Monster!

Characters

 * Thomas
 * Gordon
 * Percy
 * Emily
 * Whiff
 * Nia
 * Diesel
 * Carly
 * Sandy
 * Kana
 * The Green Troublesome Truck
 * Bruno
 * Darcy
 * Sir Topham Hatt
 * Farmer McColl
 * Mrs. McColl
 * Farmer McColl's Daughter
 * James
 * The Brown Troublesome Truck

Locations

 * Lookout Mountain
 * Lookout Mountain Mines
 * The Old Mines
 * The Crystal Cave
 * The Turntable Cavern
 * Whiff's Recycling Plant
 * Knapford
 * The Maintenance Yard
 * Vicarstown
 * Vicarstown Lighthouse
 * McColl Farm
 * Sodor Wildlife Sanctuary
 * Duck Pond
 * Crumble Canyon
 * Tidmouth Sheds

UK

 * Aaron Barashi as Thomas
 * Will Harrison-Wallace as Gordon
 * Henri Charles as Percy
 * Marie Ekins as Emily
 * Matt Coles as Whiff
 * Sade Smith as Nia
 * Henry Harrison as Diesel
 * Eva Mohamed as Carly
 * Holly Dixon as Sandy
 * Chloe Raphael as Kana
 * Jai Armstrong as the Green Troublesome Truck
 * Elliott Garcia as Bruno
 * Jessica Carroll as Darcy
 * Tom Dussek as Sir Topham Hatt

US

 * Meesha Contreras as Thomas
 * Neil Crone as Gordon
 * Charlie Zeltzer as Percy
 * Kayla Lorette as Emily
 * Joe Pingue as Whiff
 * Talia Evans as Nia
 * Will Bhaneja as Diesel
 * Jenna Warren as Carly
 * Glee Dango as Sandy
 * Ava Ro as Kana
 * Jamie Watson as the Green Troublesome Truck
 * Chuck Smith as Bruno
 * Dana Puddicombe as Darcy
 * Bruce Dow as Sir Topham Hatt

Songs

 * Warning: Biggest Adventure Ahead
 * A Whole New Place
 * Job to Do

Trivia

 * Craig Carlisle was originally the sole writer of the special, however he was later joined by Daniel Share-Strom after it was decided to give Bruno a larger role.
 * Prior to its release, this special's title was listed as both Mystery at Lookout Mountain and Mystery of Lookout Mountain. It is unknown whether these were working or alternative titles, or if these were simply misspellings.
 * This special marks the first of several things:
 * The first special to not introduce any new characters since Calling All Engines!. Although Darcy is semi-treated as one.
 * The first special in the franchise's history in which Henry and James do not make any physical appearances. Although James is mentioned.
 * The first special in the franchise's history to not premiere theatrically in the UK.
 * The first special in the franchise's history to not feature any bonus features on the US DVD release.
 * The first special to have Will Bhaneja as Diesel in the US dub.
 * The first special to have Tom Dussek as Sir Topham Hatt in the UK dub, not counting the re-dubbed version of Race for the Sodor Cup.
 * Dana Puddicombe and Jessica Carroll join the voice cast, not counting the re-dubbed version of the UK dub of Race for the Sodor Cup for the latter person.
 * Due to Meesha Contreras undergoing puberty while recording his lines in the production phase, Thomas' voice is slightly pitched up in some scenes.
 * In the second series episode, Kana Recharges, the flag that represents the Biggest Adventure Club is present onwards. Chronologically speaking, the movie takes place sometime in between Blackout! and former said episode.
 * This movie was originally scheduled to be released in select US theaters on 4th and 5th March 2023, hosted by Fathom Events, however, these events were canceled for unknown reasons.
 * Carly and Sandy's line, "Have no fear! Sandy and Carly can make your problems disappear!" is reused from the first series episode, Thomas Blasts Off.
 * The film was released in April in the US to tie in with autism awareness month, due to it marking Bruno's first appearance in a special.

Goofs

 * In the Latin-American Spanish dub, the special is titled "The Mystery of the Mountain Lookout".
 * When Thomas turns around while testing his new gear, his buffers briefly disappear.
 * When Whiff bursts out of his laboratory, his number is backwards.
 * In a few shots of the first song, some of the characters are missing:
 * In the shot before they enter the tunnel at the end of the first chorus, Nia, Diesel, Carly, Sandy and Bruno are all missing.
 * In the reused shot of Thomas, Percy, Nia and Kana during the second chorus, Bruno is missing behind Thomas.
 * In the scene where Thomas collects Bruno so he could take a break, his headlight is missing.
 * In one frame when Percy says, "Maybe there is a connection," a large chunk of Bruno's body disappears.
 * In some of the captions for the Treehouse airing, Kana is mistakenly referred to as Connor.
 * Darcy is missing her front window in a few shots when she and the Biggest Adventure Club are exchanging introductions.
 * When Bruno talks to Emily and Sir Topham Hatt, Emily's front wheels are missing.
 * When Thomas tells Whiff why Darcy came to the Recycling Plant, his bunker is missing.
 * Neil Crone and Will Harrison-Wallace are not credited for voicing Gordon in the credits for the US and UK dubs, respectively.
 * In the Sky TV page, the promo from the original series episode, No Help at All is mistakenly shown, and the title says that the special was made in 2020.

Merchandise

 * Motorized
 * Push Along