Mr. Conductor, Captain N and the Super Mario Bros. Super Show!

Based on the 1989 DiC and Viacom Cartoon, here is Mario and Luigi's first crossover.

Main Centrals

 * 1) Mr. Conductor 1, 2 and 3 (Ringo Starr, Alec Baldwin and Michael Brandon)
 * 2) Kevin Keene (Matt Hill)
 * 3) Duke (Frank Welker)
 * 4) Mario (Jeff Bennett)
 * 5) Luigi (Rob Paulsen)
 * 6) Princess Toadstool (Colleen O'Shaughnessey)
 * 7) Toad (Andrew Sabiston)
 * 8) King Bowser Koopa (Fred Tatasciore)
 * 9) Larry Koopa (Tom Kenny)
 * 10) Morton Koopa Jr. (Phil LaMarr)
 * 11) Wendy O. Koopa (Janyse Jaud)
 * 12) Iggy Koopa (Rob Paulsen)
 * 13) Roy Koopa (Jason Marsden)
 * 14) Lemmy Koopa (Lainie Frasier)
 * 15) Ludwig Von Koopa (Danny Cooksey)
 * 16) Various Kids' WB! Heroes and Villains (Themselves)

Episodes

 * 1) The Bird! The Bird! - Thomas Stories: Thomas Gets Tricked and Percy Runs Away
 * 2) Butch Mario and the Luigi Kid - Thomas Stories: