CBeebies/Thomas

Version 1 (by Thomasedsfan)

 * Pingu (from Pingu) as Thomas
 * Underground Ernie (from Underground Ernie) as Mavis
 * Clifford (from Clifford the Big Red Dog) as Gordon
 * Cookie Monster (from The Furchester Hotel) as James
 * Milo (from Tweenies) as Bill
 * Bob (from Dinopaws) as Sir Topham Hatt
 * Postman Pat (from Postman Pat) as Rusty
 * Fireman Sam (from Fireman Sam) as Toby
 * Tinky-Winky (from Teletubbies) as Emily
 * Dipsy (from Teletubbies) as Percy
 * Elmo (from The Furchester Hotel) as Murdoch
 * Grandmaster Glitch (from Go Jetters) as Boco
 * Frank the Koala (from The Koala Brothers) as Henry
 * Buster the Koala (from The Koala Brothers) as Bertie
 * Barnaby Bear (from Becky and Barnaby Bear) as Ben
 * Trixie (from LazyTown) as Daisy
 * Sarah (from Sarah & Duck) as Diesel
 * Lucy (from 64 Zoo Lane) as S.C.Ruffey
 * Robbie Rotten (from LazyTown) as Diesel 10
 * Big (from Big & Small) as Skarloey
 * Duck (from Sarah & Duck) as Duck
 * Tony (from Dinopaws) as Rosie
 * Peppa Pig (from Peppa Pig) as Duke
 * Happy (from Hey Duggee) as Belle
 * Kyan (from Go Jetters) as Donald
 * Peter Rabbit (from Peter Rabbit) as Douglas
 * Pinga (from Pingu) as Oliver
 * Betty (from Hey Duggee) as Flora
 * Kwazii (from The Octonauts) as Arthur
 * Shaun (from Shaun the Sheep) as Caroline
 * Brewster (from Chuggington) as Lady Hatt
 * Molly the Hippo (from 64 Zoo Lane) as Molly
 * Norrie (from Hey Duggee) as Elizabeth
 * Justin (from Justin's House) as Duncan
 * Small (from Big & Small) as Lady
 * Duggee (from Hey Duggee) as Whiff

Version 2 (by LegalizeAnythingMuppets)

 * Big (from Big & Small) as Thomas
 * Pingu (from Pingu) as Mavis
 * Small (from Big & Small) as Gordon
 * Bob (from Dinopaws) as Toby
 * Postman Pat (from Postman Pat) as Sir Topham Hatt
 * Pinga (from Pingu) as Daisy
 * Kyan (from Go Jetters) as Diesel
 * Ubercorn (from Go Jetters) as Diesel 10
 * Clifford (from Clifford the Big Red Dog) as Emily
 * Reg (from Rubbadubbers) as Percy
 * Sarah (from Sarah & Duck) as Rosie
 * Po (from Teletubbies) as James
 * Big Bear (from Everything's Rosie) as Bertie
 * Lucy (from 64 Zoo Lane) as Donald
 * Emily Elephant (from Peppa Pig) as Douglas
 * Happy (from Hey Duggee) as Harold
 * Tag (from Hey Duggee) as Duck
 * Nok Tok (from Waybuloo) as Henry
 * Duck (from Sarah & Duck) as Oliver
 * Betty (from Hey Duggee) as Molly
 * Mittens (from Timmy Time) as Elizabeth
 * Xuli (from Go Jetters) as Edward
 * Makka Pakka (from In The Night Garden) as Lady
 * Scoop (from Bob the Builder) as Arthur
 * Tweak (from The Octonauts) as Spencer
 * Kevin the Crocodile (from 64 Zoo Lane) as D261
 * Timmy (from Timmy Time) as Murdoch