Casey Jr./Pinocchio

Cast:

 * Percy as Pinocchio (Both son figures to Thomas and Geopetto)
 * Thomas as Geopetto (Both father figures to Percy and Pinocchio)
 * Casey Jr as Jiminy Cricket (Both follow Percy and Pinocchio)
 * Diesel as Stombroli (Both devious)
 * Cerberus as Monstro the Whale (Percy, can't be Monstro, Percy is Good and Monstro is Evil) 
 * Tillie as The Blue Fairy (Both blue, smart, and beautiful)
 * Johnny as Figaro (Both splendid)
 * Georgia as Cleo (Both beautiful)
 * Spencer as Lampwick (Spencer is evil in Hero of the Rails)
 * The trucks as The Donkeys (Both troublesome)
 * Blue Trucks as The Seaguls
 * Green Trucks as the Fishes
 * Fred the Orange Truck as the Big Fish
 * Season 1 Trucks as The Coachman's Minions 
 * Diesel 10 as Lampwick the donkey (Diesel 10 is evil in Thomas and the Magic Railroad)
 * Montana as The Wicked Coachman 
 * Stepney as Alexander
 * James as Honest John (Both red and vain)
 * Edward as Gideon (Both stick with James and Honest John)
 * Oliver as Roger Rabbit (cameo)
 * Toots, Elizabeth, Molly, Mavis, Daisy, Emily, Mellisa, Tootle, Emma, Pufle, Ivor, Jebibiah, Pete, Farnsworth, Tom Jerry, Doc, Rasmus, Jacob and Duck as the Puppets
 * Sir Reginald as Grumpy (cameo)
 * Greendale Rocket as Sleepy (cameo)
 * Jason as Happy (cameo)