CatDog, Annie and Pony Go Backstage

Based on the 2016-2017 series, here is a crossover with CatDog and It's Pony.

The Guards of Shining Time Station UK

 * 1) Mr. Guard 1 (Ringo Starr)
 * 2) Mr. Guard 2 (Michael Angelis)

The FETCH! Host

 * 1) Ruff Ruffman (Jim Conroy)

From Kratt Shows

 * 1) Chris and Martin Kratt (Themselves)
 * 2) Ttark and Zoboomafoo (Ron Rubin and Gord Robertson)
 * 3) Allison Baldwin (Shannon Duff)
 * 4) Aviva Corcovado (Athena Karkanis)
 * 5) Koki (Heather Bambrick)
 * 6) Jimmy Z (Jonathen Malen)

From Let's Go Luna!

 * 1) Luna (Judy Greer)
 * 2)   Leo (Shayle Simons)
 * 3)   Andy (Jaiden Cannatelli)
 * 4)   Carmen (Saara Chaudry)

From CatDog and It's Pony

 * 1) CatDog (Jim Cummings and Tom Kenny)
 * 2) Annie McLeach and Pony (Jessica DiCicco and Josh Zuckerman)

From Backstage

 * 1) Devyn Nekoda as Vanessa
 * 2) Alyssa Trask as Carly
 * 3) Josh Bogert as Miles
 * 4) Aviva Mongillo as Alya
 * 5) Matthew Isen as Jax
 * 6) Julia Tomasone as Bianca
 * 7) Adrianna Di Liello as Jenna
 * 8) Colin Petierre as Sasha
 * 9) Mckenzie Small as Scarlett
 * 10) Romy Weltman as Kit
 * 11) Isiah Hall as Denzel (season 1)
 * 12) Kyal Legend as Julie
 * 13) Chris Hoffman as Park
 * 14) Jane Moffat as Helsweel
 * 15) Thomas L. Colford as Beckett (season 2)

From Pokemon The Original

 * 1) Ash Ketchum and Pikachu (Sarah Natochenny and Ikue Ohtani)
 * 2) Gary Oak (Jimmy Zoppi)
 * 3) Mary and Togepi (Kerry Williams and Satomi Korogi)
 * 4) Tracey Sketchit (Craig Blair)
 * 5) Brock and Croagunk (Bill Rogers)
 * 6) Misty (Michele Knotz)

From Mucha Lucha! (with Xiaolin Showdown/Chronicles)

 * 1) Rikochet and El Rey (Carlos Alazraqui and Michael Donovan)
 * 2) The Flea (Candi Milo)
 * 3) Buena Girl (Kimberly Brooks)
 * 4) Omi (Tara Strong)
 * 5) Ping Pong (Tara Strong)
 * 6) Kimiko Tohomiko (Jennifer Hale)
 * 7) Raimundo Pedrosa (Eric Bauza)
 * 8) Clay Bailey (David Kaye)
 * 9) Dojo Kanojo Cho (Michael Donovan)
 * 10) Master Fung (Michael Donovan)

From Hoop-a-Joop

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

From Kodocha (with Aqua Age)

 * 1) Sandra Larson (Lisa Ortiz)
 * 2) Floella Thompson (Roxanne Beck)
 * 3) Felicia McCoy (Lisa Ortiz)
 * 4) Tawny McCoy (Tara Jayne)
 * 5) Aya MacDonald (Amy Birnbaum)
 * 6) Hilary Brood (Rachael Lillis)
 * 7) Katherine Jordan (Megan Hollingshead)
 * 8) Christine Richards and Serena Hamilton (Kerry Williams and Tara Jayne)
 * 9) Maya Burlington and Alexandra Hartman (Leah Applebaum and Mandy Bonhomme)
 * 10) Terri Burton (Roxanne Beck)
 * 11) Roberta Parsley, Mary Taylor, Ramona Hill, Marley Hanson and Nellie Carlin (Leah Applebaum, Megan Hollingshead, Kerry Williams, Rachael Lillis and Amy Birnbaum)
 * 12) Maritza Lamar, Karen Bernstein, Mildred Carson and Minerva Raven (Lisa Ortiz)
 * 13) Gina Logan (Tara Jayne)

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 Miccuci)

From 4th Grade Mom

 * 1) Baby Mayra (Kayzie Rogers)
 * 2) Nelly Marcos (Lisa Ortiz)
 * 3) Iris Simpson (Roxanne Beck)
 * 4) Tina Morton (Megan Hollingshead)
 * 5) Chigusa Burgh (Lisa Ortiz)
 * 6) Erica Thomas (Roxanne Beck)

From Digimon Mix

 * Tai, Kari, Agumon and Gatomon (Joshua Seth, Lara Jill Miller, Tom Fahn and Mary Elizabeth McGlynn)
 * 1) Takato Matsuki and Guilmon (Brian Beacock and Steven Jay Blum)
 * 2) Takuya Kanbara (Michael Reisz)
 * 3) Marcus Damon, Kristy Damon, Agumon and Biyomon (Quinton Flynn, Melissa Fahn, Brian Beacock and Terrence Stone)
 * 4) Mikey Kudo and Shoutmon (Nicholas Royce and Benjamin Diskin)
 * 5) Derek Shinkai and Gatchmon (Todd Haberkorn and Benjamin Diskin)

From Mon Colle Knights

 * 1) Mondo Ooya (Derek Stephen Prince)
 * 2) Rockna Hiiragi (Brianne Siddall)
 * 3) Beginner (Philece Sampler)
 * 4) Luke (Lex Lang)
 * 5) Lailai (Melissa Fahn)
 * 6) Kahimi (Tifanie Christun)

From Star Fox: The Animated Series

 * 1) Fox McCloud (Joshua Seth)
 * 2) Falco Lombardi (Derek Stephen Prince)
 * 3) Slippy Toad (Rick Jones)
 * 4) Peppy Hare (Tom Gibis)

From The Cyber Cat

 * 1) Kick (Rick Jones)
 * 2) Mini (Terrence Schammel)

From Yu-Gi-Oh! Mix

 * 1) Yami Yugi Moto (Dan Green)
 * 2) Jaden Yuki (Matthew Charles)
 * 3) Yusei Fudo (Greg Abbey)
 * 4) Yuma Tsukumo (Eli Jay)
 * 5) Yuya Sakaki (Michael Liscio Jr.)
 * 6) Yusaku Fujiki (Jake Paque)

From Static Shock

 * 1) Virgil Hawkins (Phil LaMarr)
 * 2) Sharon Hawkins (Michele Morgan)
 * 3) Robert Hawkins (Kevin Michael Richardson)
 * 4) Richie Foley (Jason Marsden)
 * 5) Maggie Foley (Jean Smart)
 * 6) Sean Foley (Dan Lauria)

From Jackie Chan Adventures

 * 1) Jackie Chan (James Sie)
 * 2) Jade Chan (Stacie Chan)
 * 3) Uncle Chan (Sab Shimono)

From Phantom Investigators

 * 1) Daemona (Jocelyn Loewen)
 * 2) Kira (Cree Summer)
 * 3) Jericho (Scott Menville)
 * 4) Casey (Jason Marsden)

From Teenage Mutant Ninja Turtles

 * 1) Leonardo (Michael Sinterniklaas)
 * 2) Raphael (Frank Frankson)
 * 3) Donatello (Sam Regal)
 * 4) Michelangelo (Wayne Grayson)

From Untroubled Space Tours

 * 1) Gordon Hooper (Eric Stuart)
 * 2) Kerry Burghs (Lisa Ortiz)
 * 3) Kenny Marigold (Roxanne Beck)
 * 4) Nora Richards (Megan Hollingshead)
 * 5) Maron the Squirrel Girl (Kayzie Rogers)
 * 6) Monica MacDonald (Tara Jayne)

From Super Pig

 * 1) Kassie Carlin (Julie Maddalena)
 * 2) Heather Hogwarsh (Laura Summer)
 * 3) Prudence Plum (Caryn Rosenthal)
 * 4) Penny Round (Wendee Lee)

From UFO Baby

 * 1) Kelly Westwood (Tifanie Christun)
 * 2) Maureen Holiday (Colleen O'Shaughnessey)
 * 3) Natalie Wellington (Philece Sampler)
 * 4) Amanda Larkin (Colleen O'Shaughnessey)
 * 5) Christine and Brianna Flowers (Laura Summer and Anna Garduno)

From Glitter Force

 * 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)

From Glitter Force Doki Doki

 * 1) Maya Aida (Debi Derryberry)
 * 2)  Rachel Larsen (Cassandra Lee Morris)
 * 3)  Clara Yotsuba (Melissa Fahn)
 * 4)  Mackenzie Mack (Stephanie Sheh)
 * 5)  Natalie Miller (Erica Lindbeck)
 * 6)  Regina and Nellie Knotty (Cherami Leigh and Laura Post)

From Cardcaptors

 * 1) Sakura Avalon and Kero (Carly McKillip and Richard Newman)
 * 2) Meilin Rae (Nicole Oliver)
 * 3) Madison Taylor (Maggie Blue O'Hara)
 * 4) Rita (Stevie Bloch)
 * 5) Chelsea (Jocelyne Loewen)
 * 6) Nikki (Kelly Sheridan)

From Flint the Time Detective

 * 1) Flint Hammerhead (R. Martin Klein)
 * 2) Sarah Goodman (Tifanie Christun)
 * 3) Tony Goodman (Brian Donovan)

From Shinzo

 * 1) Mushra (Tom Gibis)
 * 2) Sago (Steven Blum)
 * 3) Kutal (???)
 * 4) Binka (Philece Sampler)
 * 5) Yakumo Tatsuro (Peggy O'Neal)
 * Rei, Sen and Este (???, ??? and ???)

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)

From Johnny Test and Supernoobs

 * 1) Johnny Test and Dukey (James Arnold Taylor and Louis Chirillo)
 * 2) Tyler Bowman (Matt Hill)
 * 3) Jennifer Shope (Tabitha St. Germain)
 * 4) Kevin Reynolds (Richard Ian Cox)
 * 5) Theodore Roachmont (Lee Tockar)

Episodes (with UK Thomas Stories)

 * 1) The First Day - Thomas Stories: Thomas and Gordon and Edward and Gordon

Trivia

 * A 60-episode crossover in UK format.
 * Kimiko's outfit: from Season 2, Episode 22: The Apprentice.
 * Ending segment: Pikachu's Jukebox.