• Stan Marsh as Mr. Conductor (Ringo Starr)
  • Noddy as Mr. Conductor (George Carlin)
  • Wendy Testaburger as Stacy Jones
  • Kyle The Conjurer as Schemer
  • Timmy Turner as Matt
  • Tessie Bear as Tanya
  • Numbuh 1 as Dan
  • Numbuh 5 as Kara
  • May as Becky
  • Oakie Doke as Harry Cupper
  • Brock as Billy Twofeathers
  • Bart Simpson as Schemee
  • Ten Cents as JB King
  • Lillie Lightship as The Queen
  • Agnes Skinner as Midge Smoot
  • Eric Cartman as Mr. Conductor's Evil Twin
  • Jack Spicer as Buster The Bully
  • Sly and Gobbo as Bull and Biff
  • Meg Griffin as Vickie

Scooby Doo Characters as Thomas Characters

  • Shaggy as Thomas
  • Uncle Nathaniel as Edward
  • Fred as Henry
  • Batman as Gordon
  • Robin as James
  • Scooby Doo as Percy
  • Mr. McKnight as Toby
  • Scooby-Dum as Duck
  • Laurel as Donald
  • Hardy as Douglas
  • Jerry Reed as Oliver
  • Ben Ravencroft as Diesel
  • The Young Ghosts as Bill and Ben
  • Officer Wembley as Boco
  • Lena Dupree as Daisy
  • Sybella as Mavis
  • Luis as Stepney
  • Yabba Doo as Bertie
  • Sonic (from Sonic) as Skarloey
  • Tails (from Sonic) as Rheneas
  • Knuckles (from Sonic) as Sir Handel
  • Espio (from Sonic) as Peter Sam
  • Uncle Chuck (from Sonic) as Rusty
  • Antoine (from Sonic) as Duncan
  • Ari (from Sonic) as Duke
  • Snivley (from Sonic) as Smudger
  • Bill as Bulgy
  • Detective Neville as Harold
  • Simone as The Diesel
  • The Mayor of Oakhaven as Sir Topham Hatt

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