Thomas/Fanboy and Chum Chum

Version 1

 * Thomas as Fanboy (Thomas and Fanboy are both Main Heroes) (Fanboy's Voice Suits Thomas The Blue Tank Engine)
 * Percy as Chum Chum (Percy and Chum Chum are both Small and They are both Best Friends To Thomas and Fanboy) (Chum Chum's Voice Suits Percy The Small Green Tank Engine)
 * Emily as Yo (Emily and Yo are both Happy, Cheerful, Sweet, Kind, Gentle and Beautiful) (Yo's Voice Suits Emily The Sterling Tender Engine)
 * James as Kyle The Conjurer (James and Kyle The Conjurer are both Vain) (Kyle The Conjurer's Voice Suits James The Red Tender Engine)
 * Diesel as Sigmund The Sorcerer (Devious Diesel and Sigmund The Sorcerer are both Wearing Black) (Sigmund The Sorcerer's Voice Suits Devious Diesel)
 * Henry as Ozvald "Oz" Harmonian
 * Bulgy as Boog
 * Boco as Lenny
 * Gordon as Hank Mufflin
 * Madge as Mrs. Bingle
 * Harvey as Yum Yum
 * Bertie as Dollar-Nator
 * Cranky as Stinky Pink Pool
 * Jeremy as Man-Arctica
 * Edward as Agent Johnson
 * Toby as Fedora Man
 * Salty as Fankylechum
 * Dennis as Chris Chuggy
 * George as Scriveneer Elf
 * Hector as Dr. Acula
 * Mavis as Nancy Pancy
 * Molly as Lupe
 * Rosie as Girl
 * Stepney as Cher Leader
 * Flora as Lillie Lotus
 * Paxton as Mechatech
 * Daisy as Francine
 * Caroline as Marsha
 * Duke as Duke (Both share the same name)
 * Fergus as Cheech
 * Duncan as Necronomicon
 * Elizabeth as Oz's Mum
 * Diesel 10 as The Global Warmer
 * Spencer as Professor Flan
 * Lady Hatt as Lunch Lady Cram
 * Max as Brizwald
 * Jack as Berry the Ice Monster
 * Derek as Cuppy
 * Duck as Michael Johnson
 * The Spiteful Breakvan as Wally the Great
 * Sir Topham Hatt as Cecil the Magic Club President
 * D261 as Roland
 * Scruffey as Jimbo the Juggler
 * Bulstrode as Janitor Russ Poopatine
 * Lady as Muk Muk
 * Duncan as Scampers

Version 2

 * Thomas as Fanboy (Thomas and Fanboy are both The Main Heroes) (Fanboy's Voice Suits Thomas The Blue Tank Engine)
 * Percy as Chum Chum (Percy and Chum Chum are both Sidekicks To Thomas and Fanboy) (Chum Chum's Voice Suits Percy The Green Tank Engine)
 * Emily as Yo (Emily and Yo are both Kind, Gentle, Friendly, Cheerful and Beautiful) (Yo's Voice Suits Emily The Sterling Tender Engine)
 * James as Kyle The Conjurer (James and Kyle The Conjurer are both Vain) (Kyle The Conjurer's Voice Suits James The Red Engine)
 * Diesel as Sigmund The Sorcerer (Devious Diesel and Sigmund The Sorcerer are both Wearing Black) (Sigmund The Sorcerer's Voice Suits Devious Diesel)
 * Molly as Lupe
 * Mavis as Nancy Pancy
 * Rosie as Cher Leader
 * Lady as Muk Muk
 * Daisy as Francine
 * Duck as Michael Johnson
 * Oliver as Duke
 * Skarloey as Fankylechum
 * Edward as Oz
 * Gordon as Hank Mufflin
 * Boco as Lenny
 * Bulgy as Boog
 * Elizabeth as Lunch Lady Cram
 * Diesel 10 as Janitor Pooptaine
 * Derek as Agent Johnson

Version 3

 * Thomas as Fanboy
 * Percy as Chum Chum
 * Rosie as Yo
 * Duck as Kyle The Conjurer
 * Diesel as Sigmund The Sorcerer
 * Gordon as Mr. Mufflin
 * Edward as Oz
 * Mavis as Nancy Pancy
 * James as Michael Johnson
 * Emily as Lupe
 * Lady as Muk Muk
 * Molly as Cher Leader
 * Oliver as Duke
 * Whiff as FanKyleChum
 * Dennis as Chris Chuggy
 * Daisy as Francine
 * Hector as Scrivener Elf
 * Fergus as Necronomicon
 * Arry and Bert as Boog and Lenny
 * Elizabeth as Lunch Lady Cram
 * Spencer as Professor Flan
 * Diesel 10 as Janitor Poopatine

Version 4
Voice Cast
 * Thomas as Fanboy
 * Percy as Chum Chum
 * Emily as Yo
 * James as Kyle The Conjurer
 * Diesel as Sigmund The Sorcerer
 * Henry as Oz
 * Bulgy as Boog
 * Boco as Lenny
 * Gordon as Mr. Mufflin
 * Madge as Mrs. Bingle
 * Harvey as Yum Yum
 * Bertie as Dollar-Nator
 * Cranky as Stinky Pink Pool
 * Jeremy as Man Artica
 * Edward as Agent Johnson
 * Toby as Fedora Man
 * Salty as FanKyleChum
 * George as Scriveneer Elf
 * Hector as Dr. Acula
 * Paxton as Mechatech
 * Molly as Lupe
 * Mavis as Nancy Pancy
 * Rosie as Girl
 * Stepney as Cher Leader
 * Flora as Lillie Lotus
 * Daisy as Francine
 * Duke as Duke
 * Duck as Michael Johnson
 * Dennis as Chris Chuggy
 * Caroline as Marsha
 * Fergus as Cheech
 * Lady as Muk Muk
 * Rusty as Necronomican
 * Diesel 10 as The Global Warmer
 * Elizabeth as Oz's Mom
 * Spencer as Professor Flan
 * Lady Hatt as Lunch Lady Cram
 * Max as Brizwald
 * Jack as Berry the Ice Monster
 * Derek as Cuppy
 * The Spiteful Breakvan as Wally the Great
 * Sir Topham Hatt as Cecil the Magic Club President
 * D261 as Roland
 * Scruffey as Jimbo the Juggler
 * Bulstrode as Janitor Poopatine
 * Duncan as Scampers
 * David Hornsby - Thomas
 * Nika Futterman - Percy, Mavis and Lady
 * Dyana Liu - Emily
 * Jamie Kennedy - James and Salty
 * Josh Duhamel - Henry
 * Jeff Glen Bennett - Gordon, Toby, Rusty, Duke, Diesel, Edward, Jeremy, Diesel 10, Bulgy, Bertie, George and Hector
 * Wyatt Cenac - Duck and Boco
 * Kari Wahlgren - Mavis and Stepney
 * Candi Milo - Molly, Stepney, Daisy, Lady Hatt and Caroline
 * John DiMaggio - Harvey
 * Tony Harvey - The Spiteful Breakvan
 * Norry Constantion - Sir Topham Hatt
 * Dale Burridge - D261
 * Mic Conway - Scruffey
 * Steve Tompkins - Bulstrode
 * Jim Cummings - Spencer
 * Estelle Harris - Elizabeth
 * Joanne Samuel - Madge
 * Katy Perry - Flora
 * Megahan Woodhouse - Rosie
 * Eric Robbles - Dennis
 * Dee Bradley Baker - Duncan