Sonic/Thomas


 * Sonic as Thomas (Both the main heroes)
 * Uncle Chuck as Edward (Both Blue and Wise)
 * Espio as Henry (Henry's voice suits Espio)
 * Knuckles as Gordon (Both Big and Pompous)
 * Antoine as James (Both Vain)
 * Tails as Percy (Both Young)
 * Chuck Thorndyke as Toby (Both Old)
 * Rotor as Duck (Both reliable)
 * Heavy & Bomb as Donald & Douglas
 * Lucas as Oliver
 * Dr. Robotnik as Diesel (Dr. Robotnik and Diesel are both the main villains)
 * Mighty & Ray as Bill & Ben
 * Vector as BoCo
 * Breezy as Daisy (Both lazy and stubborn)
 * Rouge as Mavis (Both were rude in thier debuts)
 * Rocket as Stepney
 * Sally Acorn as Emily (Both the main females)
 * Sonic Jr. as Bertie
 * Captain Rescue as Salty
 * Big the Cat as Harvey
 * Scratch & Grounder as Arry and Bert (Scratch and Grounder are brothers, just like Arry and Bert)
 * Chip as Fergus
 * Male Cheese as Skarloey
 * Chocola as Rheneas
 * Danny as Sir Handel
 * Chris as Peter Sam
 * E-102 Gamma as Rusty
 * E-123 Omega as Duncan
 * Athair as Duke
 * G.U.N. Commander as Bertram
 * Toadsworth as Proteus
 * Big Griz and Big Mike as Mighty Mac
 * Mr. Tanaka as Arthur
 * Cream as Lady
 * Gerald Robotnik as Diesel 10 (Gerald Robotnik is a villain in Sonic X and the games)
 * Docoe & Bocoe as Splatter & Dodge
 * King Acorn as Sir Topham Hatt (Both in charge of The Planet Mobius and The Sodor Railway)
 * Queen Acorn as Lady Hatt (Both wives of King Acorn and Sir Topham Hatt
 * Wes Weasley as Terence
 * Lilly's Brother as Trevor
 * Froggy as Toad
 * Emerl as Derek
 * Snively as Bulgy (Both devious and stupid)
 * Mama Robotnik as Elizabeth (Both mothers to Dr. Robotnik and Diesel)
 * Coconuts as George
 * Ari as Murdoch
 * Shadow as Spencer (Shadow is a villain in Sonic X and the games)
 * Tikal as Caroline
 * Big Mickey (from TUGS) as Cranky
 * Cluck as Scruffey
 * The President as Mr. Percival
 * Budgie (from Budgie The Little Helicopter) as Harold
 * Amy Rose as Rosie (Both in love with Sonic and Thomas)
 * The Robots as The Troublesome Trucks
 * Fang as Smudger
 * Bark as Bulstrode
 * Flicky as Jeremey
 * Bunnie Rabbot as Molly
 * Silver as Stanley
 * Lily & Her Sister as Annie & Clarabel
 * Female Cheese as Henrietta
 * Orson (from Garfields & Friends) as Jack
 * Booker (from Garfield & Friends) as Alfie
 * Odie (from Garfield & Friends) as Oliver (Pack)
 * Wart & Mort (from Garfield & Friends) as Max & Monty
 * Plato (from Garfield & Friends) as Kelly
 * Garfield (from Garfield & Friends) as Byron
 * Wade (from Garfield & Friends) as Ned
 * Lanolin (from Garfield & Friends) as Isobella
 * Bo (from Garfield & Friends) as Nelson
 * Roy (from Garfield & Friends) as Patrick
 * Sheldon (from Garfield & Friends) as Buster
 * Liz (from Garfield & Friends) as Miss Jenny
 * Jon (from Garfield & Friends) as The Foreman
 * Max as Whiff (Both filthy)
 * Bill as Scruff
 * Trevor as Dennis
 * Mighty Moe (from TUGS) as Rocky
 * Charmy as Billy
 * Dulcy as Madge
 * Zeb as Hank
 * Cosmo as Flora
 * Sam Speed as Victor
 * Metal Sonic as The Spiteful Breakvan
 * Blaze as Old Slow Coach
 * Doctor Warpnik as D261
 * Lupe as Belle
 * Sleet as Den
 * Dingo as Dart
 * Flip as Neville
 * The Lava Monsters as The Horrid Lorries
 * Quark as The Angry Policeman
 * Denita Stokes (president of Humans Against Genesis) as The Stationmaster's Wife
 * Special Guests from The Simpsons
 * Homer Simpson as Mr. Conductor (Alec Baldwin)
 * Milhouse as Junior
 * Lisa Simpson as Lilly
 * Chief Wiggum as Patch
 * Ned Flanders as Burnett Stone
 * Principal Skinner as Billy Twofeathers
 * Marge Simpson as Stacy Jones
 * Maude Flanders as Lilly's Mom
 * Bumblebee Man as Mutt
 * Mr. Burns as PT Boomer