The Secret of the Cave Treasure is the 2021 Thomas & Friends special.

Plot

When Thomas finds an old mine exit, his news becomes spreadable to his love interest, Ashima and all of his friends. Because of that, Ashima and all of Thomas' friends make Thomas feel even prouder than he was before. But, Diesel makes a plan to make Thomas feel silly by giving him no coal and water. But, his plan backfires when he destroys Percy's new trucks which makes Percy feel very upset. So, Thomas goes on a mission to find something better than Percy's new trucks. But he gets himself trapped in an old abandoned mine and find themselves on a raging river on a raft. So all of Thomas's friends, including Nia, Dory, Marlin, Nemo, Pingu, the Teletubbies, Oh, the MerseyGirls, Ant & Dec and his new friends Charlotte and Dylan and his love interest, Ashima try to find Thomas before he is lost forever.

Characters

  • Thomas
  • Edward
  • Henry
  • Gordon
  • James
  • Percy
  • Toby
  • Emily
  • Duck
  • Donald and Douglas
  • Oliver
  • Molly
  • Flora
  • Dash
  • Bash
  • Ferdinand
  • Porter
  • Gator
  • Ashima
  • Nia
  • Rebecca
  • Diesel
  • Diesel 10
  • Salty
  • Den
  • Dart
  • Paxton
  • Sidney
  • Norman
  • Victor
  • Millie
  • Rex
  • Bert
  • Mike
  • Kevin
  • Annie and Clarabel
  • Toad
  • Judy and Jerome
  • Cranky
  • Carly
  • Big Mickey
  • Marion (cameo)

Characters Introduced

  • Charlotte
  • Dylan
  • Harley

Special Characters

  • Pingu
  • Tinky Winky
  • Dipsy
  • Laa-Laa
  • Po
  • Manny
  • Sid
  • Diego
  • Scrat
  • Lightning McQueen
  • Mater
  • Sally Carrera
  • Luigi
  • Guido
  • Dory
  • Marlin
  • Nemo
  • Woody
  • Buzz Lightyear
  • Jessie
  • Oh
  • Tip
  • Mario
  • Bob the Builder
  • Scoop
  • Muck
  • Dizzy
  • Roley
  • Lofty
  • Benny
  • Scrambler
  • Turbo
  • Chet
  • Ant & Dec
  • Stephen Mulhern
  • Basil Brush
  • Julia (MerseyGirls)
  • Alice (MerseyGirls)
  • Kate (MerseyGirls)
  • Annie (MerseyGirls)
  • Emily (MerseyGirls)
  • Becky (MerseyGirls)
  • Fey (MerseyGirls)
  • Chelsea (MerseyGirls)
  • Hamm (does not speak)
  • Mr. Potato Head (cameo)
  • Mrs. Potato Head (cameo)
  • Slinky Dog (cameo)
  • Rex the Dinosaur (cameo)
  • The Three Aliens (cameo)
  • Trixie (cameo)
  • Buttercup (cameo)
  • Mr. Pricklepants (cameo)
  • Peas-in-a-Pod (cameo)
  • Destiny (mentioned)
  • Bob the Builder (trailers only)
  • Fireman Sam (dropped)
  • Barney (dropped)
  • Angelina Ballerina (dropped)

Cast

UK, AUS and NZ

  • Freddie Flintoff as the Narrator
  • John Hasler as Thomas and Ferdinand
  • Keith Wickham as Edward, Henry, Gordon, Dash, Den, Norman, Bert, Glynn and The Fat Controller
  • Rob Rackstraw as James, Toby, Donald, Scoop and Muck
  • Nigel Pilkington as Percy and Trevor
  • Teresa Gallagher as Emily, Judy, Annie and Clarabel
  • Steve Kynman as Duck and Porter
  • Joe Mills as Douglas, Oliver and Toad
  • Matt Wilkinson as Cranky, Bash, Stanley and Diesel 10
  • Nicola Stapleton as Rosie
  • David Bedella as Victor
  • Tim Whitnall as Mike and Jerome
  • Tom Stourton as Terence and Rex
  • Bob Golding as Sidney and Stephen
  • Lucy Montgomery as Carly
  • Tina Desai as Ashima
  • Yvonne Grundy as Nia
  • Rachel Miller as Rebecca and Flora
  • Hero Fiennes Tiffin as Dylan
  • Josephine Langford as Charlotte
  • Oti Mabuse as Harley
  • Mollie Gallagher as Molly
  • David Sant as Pingu (archive recordings)
  • Simon Shelton as Tinky Winky (archive recordings)
  • John Simmit as Dipsy (archive recordings)
  • Nikky Smedley is Laa-Laa (archive recordings)
  • Pui Fan Lee as Po (archive recordings)
  • Ray Romano as Manny
  • John Leguizamo as Sid
  • Denis Leary as Diego
  • Chris Wedge as Scrat
  • Owen Wilson as Lightning McQueen
  • Larry the Cable Guy as Mater
  • Bonnie Hunt as Sally Carrera
  • Tony Shalhoub as Luigi
  • Guido Quaroni as Guido
  • Ellen DeGeneres as Dory
  • Albert Brooks as Marlin
  • Hayden Rolance as Nemo
  • Tom Hanks as Woody
  • Tim Allen as Buzz Lightyear
  • Joan Cussack as Jessie
  • Jim Parsons as Oh
  • Rihanna as Tip
  • Charles Marniet as Mario
  • Ryan Reynolds as Turbo
  • Paul Giamatti as Chet
  • Neil Morrissey as Bob the Builder, Roley and Lofty
  • Kate Harbour as Dizzy
  • Emma Tate as Benny
  • Rupert Degas as Scrambler
  • Anthony McPartlin as Himself
  • Declan Donnelly as Himself
  • Stephen Mulhern as Himself
  • Julia Charlie as Herself
  • Alice Charlie as Herself
  • Kate Newman as Herself
  • Emily Chapman as Herself
  • Fey..... as Herself
  • Annie Winstanley as Herself
  • Chelsea Evans as Herself
  • Basil Brush as Himself
  • William Hope as Miner 1
  • Mark Moraghan as Miner 2

US and CAN

  • Freddie Flintoff as the Narrator
  • Joseph May as Thomas
  • William Hope as Edward, Toby, Dash and Miner 1
  • Kerry Shale as Henry, Gordon, Bash and Kevin
  • Rob Rackstraw as James, Donald and Stanley
  • Christopher Ragland as Percy
  • Jules de Jongh as Emily
  • Keith Wickham as Den, Norman, Bert, Glynn and The Fat Controller
  • Nigel Pilkington as Trevor
  • Teresa Gallagher as Judy, Annie and Clarabel
  • Steve Kynman as Duck
  • Joe Mills as Douglas, Oliver and Toad
  • Matt Wilkinson as Diesel 10
  • David Menkin as Porter and Scoop
  • Glenn Wrage as Cranky and Ferdinand
  • Nicola Stapleton as Rosie
  • David Bedella as Victor
  • Tim Whitnall as Mike and Jerome
  • Tom Stourton as Terence and Rex
  • Bob Golding as Sidney and Stephen
  • Lucy Montgomery as Carly
  • Tina Desai as Ashima
  • Yvonne Grundy as Nia
  • Rachel Miller as Rebecca and Flora
  • Hero Fiennes Tiffin as Dylan
  • Josephine Langford as Charlotte
  • Oti Mabuse as Harley
  • Mollie Gallagher as Molly
  • David Sant as Pingu (archive recordings)
  • Simon Shelton as Tinky Winky (archive recordings)
  • John Simmit as Dipsy (archive recordings)
  • Nikky Smedley is Laa-Laa (archive recordings)
  • Pui Fan Lee as Po (archive recordings)
  • Ray Romano as Manny
  • John Leguizamo as Sid
  • Denis Leary as Diego
  • Chris Wedge as Scrat
  • Owen Wilson as Lightning McQueen
  • Larry the Cable Guy as Mater
  • Bonnie Hunt as Sally Carrera
  • Tony Shalhoub as Luigi
  • Guido Quaroni as Guido
  • Ellen DeGeneres as Dory
  • Albert Brooks as Marlin
  • Hayden Rolance as Nemo
  • Tom Hanks as Woody
  • Tim Allen as Buzz Lightyear
  • Joan Cussack as Jessie
  • Jim Parsons as Oh
  • Rihanna as Tip
  • Charles Marniet as Mario
  • Ryan Reynolds as Turbo
  • Paul Giamatti as Chet
  • Marc Silk as Bob the Builder
  • Sophie Aldred as Muck
  • Claire Corlett as Dizzy
  • Lorelei King as Roley
  • Lizzie Waterworth as Lofty
  • Anthony McPartlin as Himself
  • Declan Donnelly as Himself
  • Stephen Mulhern as Himself
  • Julia Charlie as Herself
  • Alice Charlie as Herself
  • Kate Newman as Herself
  • Emily Chapman as Herself
  • Fey..... as Herself
  • Annie Winstanley as Herself
  • Chelsea Evans as Herself
  • Basil Brush as Himself
  • William Hope as Miner 1
  • Mark Moraghan as Miner 2

Trivia

  • According to Mattel, Fireman Sam, Barney, Kipper and Angelina Ballerina were meant to appear in the movie due to storyboard ideas. But, those characters were dropped.
    • If the characters were to appear, this would have happened, this would have been Barney and Kipper's first appearances in full CGI.
  • This special was originally going to be animated by Nelvana. But, because of the negative impact on Thomas & Friends: All Engines Go!, the animation company was changed.
  • This movie marks the first of a few things:
    • The first special to be produced by HIT Entertainment in association with Mattel Television.
    • The first appearances of all crossover characters featured in this special.
    • The first appearance of Molly since the eleventh series episode Thomas Sets Sail as well as her first speaking role and first appearance in a special since The Great Discovery.
      • It's also her first appearance in full CGI.
    • The first appearance of Flora since the twelfth series epsiode Tram Trouble as well as first appearance in CGI and her first appearance in a special.
    • The first appearance of Diesel 10 since the seventeenth series episode, The Missing Christmas Decorations as well as his first appearance in a special since Day of the Diesels.
    • The first appearance of Bash, Dash and Ferdinand since the sixteenth series episode, The Christmas Tree Express, as well as their first appearances in a special since Misty Island Rescue.
    • The first special animated in full CGI by Xing Xing Animation.
    • The first special narrated by Freddie Flintoff in both English dubs.
    • The first special since Journey Beyond Sodor to have a narrator in both English dubs.
    • The first appearance of Benny since Project: Build It!, Bob the Builder's sequel series as well as his first appearance in a feature lengthed special since Snowed Under: The Bobblesberg Winter Games.
      • It is also his first appearance in full CGI.
    • Bob, Scoop, Muck, Dizzy, Roley and Lofty's first appearance in their original designs since Ready, Steady, Build!.
  • This movie marks the last of a few things:
    • The last feature length special in the main show. The feature lengthed specials that would be released furthermore would be in the spin-off.
  • This movie marks the only time of a few things:
    • The only appearance of Manny, Sid, Diego, Scrat, Chet, Basil Brush and Stephen Mulhern in the franchise as well as their only appearances in a special.
    • The only special in the main show to be animated by Xing Xing Animation.

Goofs

  • In the scene in where Ant & Dec use their launcher to hit the giant rock, their medium sized rock hit it very hard and succeeds with the rocks blocking the cave exit. But, in reality, they wouldn't be able to do it.
  • The Other Side by Jason Derulo and Midnight Sky by Miley Cyrus are shown in the credits when they actually weren't heard in the film. The issue was corrected in the bonus features.
  • A faint crack is seen at Tidmouth Sheds when the scene cuts to the MerseyGirls being sad.
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