FETCH! with Ruff Ruffman (Mr. Conductor Series)

Based on the 2006 PBS Kids series, here is a crossover.

The Conductors of Shining Time Station

 * 1) Mr. Conductor 1 (George Carlin)
 * 2) Mr. Conductor 2 (Alec Baldwin)
 * 3) Mr. Conductor 3 (Michael Brandon)

The Bunnies of Warner Bros. Animation

 * 1) Buster Bunny (Charlie Adler)
 * 2) Bugs Bunny (Jeff Bergman)
 * 3) Ace Bunny (Charlie Schlatter)
 * 4) Babs Bunny (Tress MacNeille)
 * 5) Lola Bunny (Kristen Wig)
 * 6) Lexi Bunny (Jessica DiCicco)

Discovery Kids's Famous Mascots

 * 1) Doki (Griffin Hook)
 * 2) Paz the Penguin (Tim Lagasse)

Super Mario Alumni

 * 1) Mario (Jeff Bennett)
 * 2) Luigi (Rob Paulsen)
 * 3) Princess Toadstool (Colleen O'Shaughnessey)
 * 4) Toad, Yoshi and Oogtar (Andrew Sabiston)
 * 5) Lakitu (Tom Kenny)
 * 6) Bumpty (Candi Milo)
 * 7) Poochy (Frank Welker)
 * 8) Flutter (Tress MacNeille)
 * 9) Prince Froggy (Rodger Bumpass)
 * 10) Gargantua Blargg (Ian James Corlett)
 * 11) Lunge Fish (Carlos Alazraqui)
 * 12) Raphael Raven (Kevin Michael Richardson)
 * 13) King Bowser Koopa (Jim Cummings)
 * 14) Hookbill Koopa, Naval Piranha and Kamek (Corey Burton, Cree Summer, and Rob Paulsen)
 * 15) Larry, Morton, Wendy, Iggy, Roy, Lemmy and Ludwig Von Koopa (Tom Kenny, Dorian Harewood, Janyse Jaud, Rob Paulsen, Jason Marsden, Lainie Frasier and Danny Cooksey)
 * 16) Casey Penguin and Princess Froggy (Debi Derryberry and Lisa Ann Beley)

From Donkey Kong: Animated

 * 1) Donkey Kong (Richard Yearwood)
 * 2) Diddy Kong (Andrew Sabiston)
 * 3) Candy Kong (Lori Alan)
 * 4) Dixie and Tiny Kong (Maggie Blue O'Hara)
 * 5) Cranky Kong (Frank Welker)
 * 6) Funky Kong (Phil LaMarr)
 * 7) Lanky and Chunky Kong (Rob Paulsen and Kevin Michael Richardson)
 * 8) Bluster Kong (Tom Kenny)
 * 9) Timber, Tiptup, Pipsy, Bumper, Drumstick and T.T. (Joanne Vannicola, Julie Lemieux, Chantal Strand, David Kaufman, Jim Cummings and Samuel Vincent)
 * 10) King K. Rool (Andrew Jackson)
 * 11) Krunch (Danny Cooksey)
 * 12) Wizpig (Jim Cummings)
 * 13) Klump and Krusha (Jess Harnell and Billy West)
 * 14) Taj (Kevin Michael Richardson)

Golden Book Heroes

 * 1) Poky Little Puppy (Elizabeth Daily)
 * 2) Saggy Baggy Elephant (Candi Milo)
 * 3) Scuffy Tugboat (Tara Strong)

The Host

 * 1) Ruff Ruffman (

From Glitter Force and Glitter Force Doki Doki

 * 1) Emily Anderson (Laura Bailey)
 * 2)   Kelsey Ace (Colleen O'Shaughnessey)
 * 3)   Lily Parker (Alex Cazares)
 * 4)   April Swanson (Danielle Judovits)
 * 5)   Chloe Rose (Kate Higgins)
 * 6)   Maya Aida (Debi Derryberry)
 * 7)  Rachel (Cassandra Lee Morris)
 * 8)  Clara Yotsuba (Melissa Fahn)
 * 9)  Mackenzie Mack (Stephanie Sheh)
 * 10)  Natalie (Erica Lindbeck)
 * 11)  Candy (Debi Derryberry)
 * 12)  Pop (Todd Haberkorn)
 * 13)  Natalie (Erica Lindbeck)
 * 14)  Kippie (Tara Sands)
 * 15)  Davi (Erica Mendez)
 * 16)  Rory (Stephanie Sheh)
 * 17)  Lance (Bryce Papenbrook)
 * 18)  Dina (Yuka Imai)
 * 19)  Regina (Cherami Leigh)
 * 20) Nellie Knotty (Laura Post)
 * 21) Sabrina and Johnny Mason (Mary Elizabeth McGlynn and Grant George)

From Totally Spies

 * 1) Clover Ewing (Andrea Baker)
 * 2) Sam Simpson (Jennifer Hale)
 * 3) Alex Vazquez (Katie Griffin)

From Pokemon

 * 1) Ash Ketchum and Pikachu (Sarah Natochenny and Ikue Ohtani)
 * 2) Gary Oak (Jimmy Zoppi)
 * 3) Brock (Bill Rogers)
 * 4) Misty (Michele Knotz)
 * 5) Tracey Sketchit (Craig Blair)
 * 6) Jessie, James, Meowth and Wobbuffet (Michele Knotz, Jimmy Zoppi and Kayzie Rogers)

From Scooby-Doo

 * 1) Scooby-Doo (Frank Welker)
 * 2) Shaggy Rogers (Matthew Lillard)
 * 3) Fred Jones (Frank Welker)
 * 4) Daphne Blake (Grey Griffin)
 * 5) Velma Dinkley (Kate Micucci)

From Mucha Lucha!

 * 1) Rikochet (Carlos Alazraqui)
 * 2) The Flea (Candi Milo)
 * 3) Buena Girl (Kimberly Brooks)

From Miraculous: Tales of Ladybug and Cat Noir

 * 1) Marinette Dupain-Cheng (Christina Vee)
 * 2) Alya Cesaire (Carrie Keranen)
 * 3) Chloe Bourgeois (Selah Victor)
 * 4) Sabrina Raincomprix (Cassandra Lee Morris)
 * 5) Lila Rossi (Lisa Kay Jennings)
 * 6) Aurore Beaureal and Mireille Caquet (Mela Lee)
 * 7) Rose Lavillant (Reba Buhr)
 * 8) Juleka Couffaine (Reba Buhr)
 * 9) Mylene Haprele (Jessica Gee)
 * 10) Alix Kubdel (Kira Buckland)

From Cardcaptors

 * 1) Sakura Avalon and Kero (Carly McKillip and Richard Newman)
 * 2) Meilin Rae (Nicole Oliver)
 * 3) Li Showron (Jordan Kilik)
 * 4) Madison Taylor (Maggie Blue O'Hara)
 * 5) Rita (Stevie Bloch)
 * 6) Chelsea (Jocelyne Loewen)
 * 7) Zachary Marker (Phillip Pacaud)
 * 8) Nikki (Kelly Sheridan)

From Mysticons

 * 1) Arkayna Goodfey (Alyson Court)
 * 2) Zarya Moonwolf (Nicki Burke)
 * 3) Emerald Goldenbraid (Evany Rosen)
 * 4) Piper Willowbrook (Ana Sani)

From Marilyn

 * 1) Marilyn Shine (Tara Strong)
 * 2) Madelyn Glaze (Maggie Blue O'Hara)
 * 3) Malinda Doe (Jocelyn Loewen)
 * 4) Emma Bore (Tress MacNeille)
 * 5) Susie Feeble (Chantal Strand)
 * 6) Tuesday Van Dour (Melissa Fahn)
 * 7) Fanny Rogers (Cheryl Chase)
 * 8) Gretchen Dismal (Kath Soucie)

From Kodocha

 * 1) Sandra Larson and Babbit (Lisa Ortiz and Jimmy Zoppi)
 * 2) Floella Thompson and Julie Benjamin (Roxanne Beck)
 * 3) Aya MacDonald (Kayzie Rogers)
 * 4) Maya Burlington and Alexandra Hartman (Leah Applebaum and Mandy Bonhomme)
 * 5) Hilary Brood and Katherine Jordan (Rachael Lillis and Megan Hollingshead)
 * 6) Christine Richards and Serena Hamilton (Amy Birnbaum and Tara Jayne)
 * 7) Anthony Redford, Thomas and Annabelle Olson, Sylvester Carlton and Norman Barges (Andrew Rannells, Amy Birnbaum, Kayzie Rogers, Matthew Mitler and Jimmy Zoppi)

From Hoop-a-Joop

 * 1) Al Smith (Tom Kenny)
 * 2) Amy Sommerstein (Dionne Quan)
 * 3) James Carmichael (Rob Paulsen)
 * 4) Mel Szyslak (Nika Futterman)

From Jonny Quest

 * 1) Jonny Quest (Jason Marsden)
 * 2) Emily Harper (Grey Griffin)
 * 3) Hadji Singh (Phil LaMarr)
 * 4) Harley Cruz (Rosie Perez)
 * 5) Jessie Bannon (Jennifer Hale)
 * 6) Bruce Small (Matt Hill)

From SWAT Kats

 * 1) Chance Furlong/T-Bone (Charlie Adler)
 * 2) Jake Clawson/Razor (Tom Kenny)
 * 3) Lena Feral/She-Bone (Jennifer Hale)
 * 4) Marissa Briggs/She-Razor (Grey Griffin)

From Aqua Age

 * 1) Felicia and Tawny McCoy (Lisa Ortiz and Tara Jayne)
 * 2) Terri Burton (Roxanne Beck)
 * 3) Henry Norbert (Ted Lewis)
 * 4) Norman Dilbert (Matthew Mitler)
 * 5) Roberta Parsley, Ramona Hill, Mary Taylor, Marley Hanson and Nellie Carlin (Leah Applebaum, Kerry Williams, Megan Hollingshead, Rachael Lillis and Amy Birnbaum)
 * 6) Bruce Percival (Eric Stuart)
 * 7) Maritza Lamar and Mildred Carson (Kayzie Rogers)
 * 8) Karen Bernstein and Minerva Raven (Lisa Ortiz)
 * 9) Herbert Simpson (Jimmy Zoppi)
 * 10) Frederick "Fred" Foley (Wayne Grayson)
 * 11) Irwin Danson (Andrew Rannells)

From Phantom Investigators

 * 1) Daemona Prune (Jocelyne Loewen)
 * 2) Kira Williams (Cree Summer)
 * 3) Jericho Anderson (Scott Menville)
 * 4) Casey Matthews (Jason Marsden)

From The Riding Hood Warrior

 * 1) Carla Manson (Carly McKillip)
 * 2)  Ringo Burghs (Joanne Vannicola)
 * 3)  Darryl Parsons (Lainie Frasier)
 * 4)  Yolanda Harrison (Susan Laney Dalton)
 * 5)  Marina Barton (Maggie Blue O'Hara)
 * 6)  Charlene Langley (Chantal Strand)

Sandra's Cheer Squad

 * 1) Lisa Brandon (Lisa Yamanaka)
 * 2) Stephanie Carlson (Maggie Blue O'Hara)
 * 3) Riley Edwin (Kelly Sheridan)
 * 4) Sweet Mint (Lisa Ortiz)
 * 5) Toni and Mika Morgan (Lisa Ortiz)
 * 6) Rita Harrington (Lisa Ortiz)

Episodes

 * 1) 3-2-1 Blast Off! - Thomas Stories: Thomas Gets Tricked and Edward Helps Out (taken from A Place Unlike Any Other)

Trivia

 * A crossover focusing on Ruff Ruffman.
 * Total of Season 1 episodes: 20.