Alvin and Friends Meet Dudley the Dragon

Based on The Adventures of Dudley the Dragon, here is his crossover with Alvin and Friends.

The Guards of Shining Time Station UK

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

Chipmunks and Chipettes

 * 1) Alvin (Ross Bagdasarian Jr.)
 * 2) Brittany (Janice Karman)
 * 3) Theodore (Janice Karman)
 * 4) Eleanor (Vanessa Bagdasarian)
 * 5) Simon (Ross Bagdasarian Jr.)
 * 6) Jeanette (Janice Karman)

From Lalaloopsy

 * 1) Rosy Bumps N Bruises (Emma Duke)
 * 2) Spot Splatter Splash (Tate McRae)
 * 3) Jewel Sparkles (Selia Sangra)
 * 4) Storm E. Sky (Mariee Devereux)
 * 5) Crumbs Sugar Cookie (Jocelyne Loewen)
 * 6) Dot Starlight (Marÿke Hendrikse)

From CatDog and Piny: Pinypon Institute of New York

 * 1) CatDog (Jim Cummings and Tom Kenny)
 * 2) Michelle Fairchild (Erin Fitzgerald)
 * 3) Tasha Robinson (Cassandra Lee Morris)
 * 4) Lilith Henderson (Erica Lindbeck)

From The Adventures of Dudley the Dragon

 * 1) Dudley the Dragon (Alex Galatis)

Heroes of Universal Kids

 * 1) Barney (Dean Wendt)
 * 2) Littlefoot the Dinosaur (Cody Arens)
 * 3) Christopher and Martin Kratt (Themselves)
 * 4) Gillian and Angeline Espina (Themselves)
 * 5) Clover Ewing, Alexandra Vazquez and Samantha Simpson (Andrea Baker, Katie Griffin and Jennifer Hale)
 * 6) Kelly Quinn, Darby O'Brien and Hannah Parker-Kent (Olivia Sanabia, Abby Donnelly and Aubrey Miller)
 * 7) Polly Pocket, Shani and Lila Draper (Emily Tennant, Kazumi Evans and Shannon Chan-Kent)
 * 8) Emma, Lachy, Simon and Anthony Wiggle (Emma Watkins, Lachlan Gillespie, Simon Pryce and Anthony Field)
 * 9) Waldo and Wenda (Joshua Rush and Haley Tju)
 * 10) Norman Picklestripes (Dwayne Hill)
 * 11) Puss in Boots and Dulcinea (Eric Bauza and Jayma Mays)
 * 12) Hiccup Horrendous Haddock, Dak and Leyla (Jay Baruchel, Nicolas Cantu and Brennley Brown)

Heroes of 4Kids/Warner Bros./Saban/DreamWorks

 * 1) Ash Ketchum, Mary, Pikachu and Togepi (Sarah Natochenny, Kerry Williams, Ikue Ohtani and Satomi Korogi)
 * 2) Rikochet and El Rey (Carlos Alazraqui and Michael Donovan)
 * 3) Al Smith (Tom Kenny)
 * 4) Sandra Larson and Babbit (Lisa Ortiz and Jimmy Zoppi)
 * 5) Zoey Hanson and Mini Mew (Amanda Brown and Tom Wayland)
 * 6) Scooby-Doo and Shaggy Rogers (Frank Welker and Matthew Lillard)
 * 7) Link (Eric Stuart)
 * 8) Ingrid Harper (Lisa Ortiz)
 * 9) Tai Kamiya, Kari Kamiya, Agumon and Gatomon (Joshua Seth, Lara Jill Miller, Tom Fahn and Mary Elizabeth McGlynn)
 * 10) Flint Hammerhead (R. Martin Klein)
 * 11) Mushra (Tom Gibis)
 * 12) Mondo Ooya (Derek Stephen Prince)
 * 13) Turbo and Chet (Reid Scott and Eric Bauza)
 * 14) Eep Crood (Stephanie Lemelin)
 * 15) Adora (Aimee Carrero)
 * 16) Audrey and Zoe (Stephanie Lemelin and Cree Summer)
 * 17) Yami Yugi Moto (Dan Green)
 * 18) Virgil and Sharon Hawkins (Phil LaMarr and Michele Morgan)
 * 19) Gordon and Yesenia Rae Hooper (Eric Stuart and Tara Jayne)
 * 20) Felicia and Tawny McCoy (Lisa Ortiz and Tara Jayne)
 * 21) Fox McCloud and Tricky (Joshua Seth and R. Martin Klein)
 * 22) Marina and Brenda Liteyears (Wendee Lee and Anna Garduno)
 * 23) Kick the Cyber Cat (Rick Jones)
 * 24) Kelly Westwood (Tifanie Christun)
 * 25) Sonic the Hedgehog and Christopher Thorndyke (Jason Griffith and Suzanne Goldish)
 * Omi, Kimiko Tohomiko, Raimundo Pedrosa and Clay Bailey (Tara Strong, Jennifer Hale, Eric Bauza and David Kaye)
 * 1) Jason Lee Scott, Tommy Oliver, Zachary Taylor, Billy Cranston, Trini Kwan and Kimberly Ann Hart (Austin St. John, Jason David Frank, Walter Emanuel Jones, David Yost, Thuy Trang and Amy Jo Johnson)
 * 2) Leonardo, Raphael, Donatello and Michelangelo (Michael Sinterniklaas, Frank Frankson, Sam Regal and Wayne Grayson)
 * 3) Johnny Test and Dukey (James Arnold Taylor and Louis Chirillo)
 * 4) Tyler Bowman, Kevin Reynolds, Theodore Roachmont and Jennifer Shope (Matt Hill, Richard Ian Cox, Lee Tockar and Tabitha St. Germain)

Bad Girls of Toon Universal

 * 1) Meilin Rae (Nicole Oliver)
 * 2) Malinda Doe (Jocelyne Loewen)
 * 3) Mayuko Kiyokawa (Rachael Lillis)
 * 4) Jasmine, Tapioca and Litchee (Leah Applebaum and Veronica Taylor)
 * 5) Frufru Tattoo Machofrou (Grey Griffin)
 * 6) The Becky Trio (Lisa Ortiz, Tara Jayne and Veronica Taylor)
 * 7) Terri Burton (Roxanne Beck)
 * 8) Princess Kenny Marigold, Monica MacDonald and Nora Richards (Roxanne Beck, Tara Jayne and Megan Hollingshead)
 * 9) Anne Granger (Carrie Keranen)
 * 10) Vivian Goodwin (Anna Garduno)
 * 11) Jordin Hanson (Colleen O'Shaughnessey)
 * 12) Abigail Thompson (Laura Summer)
 * 13) Josie Caldwell (Laura Summer)
 * 14) Christine and Brianna Flowers (Laura Summer and Anna Garduno)
 * 15) Reese Wilson (Laura Summer)
 * 16) Catra (A.J. Michalka)
 * 17) Mandy, Mindy, Caitlin and Dominique (Jennifer Hale, Katie Griffin and Andrea Baker)
 * 18) Gwen Grande (Rhona Rees)
 * 19) Penelope Lang (Catherine Disher)
 * 20) Odlulu (Eva Carlton)
 * 21) Julia Cooper, Rita Finucci and Dory Skornik (Cristina Vee, Kira Buckland and Laura Post)

Villains

 * 1) Jessie, James, Meowth and Wobbuffet (Michele Knotz, Jimmy Zoppi and Erica Schroeder)
 * 2) Ken and Mary (Marc Thompson and Caroline Hellman)
 * 3) Ludwig Von Monsterstein Eccentro, Batch, Gluko and Impy (Joe Ochman, Wendee Lee, Dina Sherman and R. Martin Klein)
 * 4) Wolf, Leon, Pigma, Andrew and Panther (Richard Epcar, David Lodge, Lex Lang, Dave Mallow and Richard Cansino)
 * 5) Dren (Andrew Rannells)
 * 6) Petra Fina Dagmar, Mite and Fishman (Barbara Goodson, David Lodge and Lex Lang)
 * 7) Prima Donna Hodges, Carlton Cold Jones and Heavy Traffic (Kathleen Barr and Scott McNeil)
 * 8) Ganondorf (Ted Lewis)
 * 9) Cassidy and Butch (Emlyn Morinelli and Jimmy Zoppi)
 * 10) Giovanni and Dr. Namba (Craig Blair and Jimmy Zoppi)
 * 11) Cliff, Shriek and Lube (Tom Kenny, Maria Bamford and Carlos Alazraqui)

Sandra's Cheer Squad

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

Episodes (with UK Dubbed Thomas Stories)

 * 1) Dudley Finds His Home - Thomas Stories: Thomas and Gordon and Edward and Gordon
 * 2) Dudley's Tea Party - Thomas Stories: Cranky Bugs and Thomas and The Rumours
 * 3) Mr. Crabby Tree - Thomas Stories: Come Out, Henry! and Henry To The Rescue
 * 4) Dudley and The Genie - Thomas Stories: Salty's Secret and Harvey To The Rescue
 * 5) Dudley Meets Mr. Can - Thomas Stories: Percy, James and The Fruitful Day and Steam Roller
 * 6) Dudley Gets a Tummy Ache - Thomas Stories: What's The Matter With Henry? and Toby and The Windmill
 * 7) Dudley Meets A Tiny Giant - Thomas Stories: Rusty Helps Peter Sam and A Better View For Gordon
 * 8) High Flying Dragon - Thomas Stories: Harold and The Flying Horse and Hooray For Thomas
 * 9) Dudley and The Toxin - Thomas Stories: Double Trouble and James In A Mess
 * 10) Dudley Goes Camping - Thomas Stories: Henry's Forest and James and The Trouble With Trees
 * 11) Dudley In The Rain Forest - Thomas Stories: Donald and Douglas and The Deputation
 * 12) Dudley and The Dodo - Thomas Stories: Baa! and A Big Surprise For Percy
 * 13) Dudley and The Gingerbread House - Thomas Stories: Home At Last and Rock 'N' Roll
 * 14) Dudley and The Snowman - Thomas Stories: A Scarf For Percy and Snow
 * 15) Dudley Through The Looking Glass - Thomas Stories: Edward The Really Useful Engine and Rusty Saves The Day
 * 16) Dudley and The King - Thomas Stories: James and The Queen of Sodor and Gordon and Spencer
 * 17) Have Yourself a Crabby Little Christmas - Thomas Stories: Thomas' Christmas Party and Thomas and The Missing Christmas Tree
 * 18) Dudley and The Leprechaun - Thomas Stories: Peter Sam and The Refreshment Lady and Percy's Chocolate Crunch
 * 19) Dragons Ahoy! - Thomas Stories: Salty's Stormy Tale and Trusty Rusty
 * 20) Dudley and The Great Race - Thomas Stories: Terence The Tractor and Thomas and Bertie's Great Race
 * 21) Dudley Meets Pablo Pickle - Thomas Stories: Daisy and Percy's Predicament
 * 22) Dudley Makes a Movie - Thomas Stories: Tender Engines and Toby Had A Little Lamb
 * 23) Dudley and Flammo the Magician - Thomas Stories: No Joke For James and James and The Red Balloon
 * 24) Dudley Meets The Alien - Thomas Stories: Dunkin Duncan and Faulty Whistles
 * 25) Imagine That! - Thomas Stories: The Old Bridge and The Grand Opening
 * 26) The Living Doll - Thomas Stories: Gordon Takes A Dip and Down The Mine
 * 27) The Spooky Castle - Thomas Stories: Percy's Ghostly Trick and Woolly Bear
 * 28) The Tree House - Thomas Stories: Passengers and Polish and Gallant Old Engine
 * 29) The Unhappy Garden - Thomas Stories: A Bad Day For Sir Handel and A Bad Day For Harold
 * 30) Dudley and The Lion - Thomas Stories: The Spotless Record and Something Fishy
 * 31) Mr. Crabby Tree's Really Great Adventure - Thomas Stories: Henry's Special Coal and The Flying Kipper
 * 32) Once Upon a Time - Thomas Stories: Granpuff and Sleeping Beauty
 * 33) Dudley and the Caveman - Thomas Stories: Bulgy and Bye George!
 * 34) Dudley's Amazing Journey - Thomas Stories: Whistles and Sneezes and Bertie's Chase
 * 35) The Trouble with Bubbles - Thomas Stories: Bill, Ben and Fergus and Thomas and The Search For Fergus
 * 36) The Red Sneakers - Thomas Stories: Foolish Freight Cars and A Proud Day For James
 * 37) Dudley and the Lost City - Thomas Stories: Double Teething Troubles and Thomas, Percy and Old Slowcoach
 * 38) The Frog Princess - Thomas Stories: Percy and The Signal and Wrong Road
 * 39) The Royal Crown - Thomas Stories: Gordon and The Famous Visitor and Thomas Meets The Queen
 * 40) You and Me and Caveman Makes Three - Thomas Stories: The World's Strongest Engine and Middle Engine
 * 41) Dudley's Birthday Surprise - Thomas Stories: Edward, Trevor and The Really Useful Party and Lady Hatt's Birthday Party
 * 42) Dudley and the Tiny Raincloud - Thomas Stories: Percy's Promise and Toby and The Flood
 * 43) Dudley and the Tooth Fairy - Thomas Stories: A Big Day For Thomas and Trouble For Thomas
 * 44) Good Knight Dragon - Thomas Stories: Bulldog and You Can't Win
 * 45) Dudley and the Balloon Forest - Thomas Stories: Henry and The Elephant and Make Someone Happy
 * 46) Mama Crabby Tree - Thomas Stories: Special Attraction and Sir Topham Hatt's Holiday
 * 47) Sammy the Flying Frog - Thomas Stories: Put Upon Percy and Oliver's Find
 * 48) Junior Robin's Big Day Out - Thomas Stories: The Runaway and Percy Takes The Plunge
 * 49) Showbiz Dragon - Thomas Stories: Busy Going Backwards and Thomas and The Jet Engine
 * 50) The Prince's New Clothes - Thomas Stories: Rheneas and The Roller Coaster and The Runaway Elephant
 * 51) Alphabet Dragon - Thomas Stories: Tenders and Turntables and Trouble In The Shed
 * 52) Dudley and the Cowardly Ghost - Thomas Stories: Bad Day At Castle Loch and Peace and Quiet
 * 53) Dudley's Big Decision - Thomas Stories: Fish and Something In The Air
 * 54) Mr. Crabby Tree Falls in Love - Thomas Stories: Time For Trouble and Elizabeth The Vintage Quarry Truck
 * 55) Doggone Dragon - Thomas Stories: James Goes Buzz, Buzz and Gordon and The Gremlin
 * 56) The Royal Cup - Thomas Stories: Thomas, Percy and The Mail Train and Mind That Bike
 * 57) The Wishing Well - Thomas Stories: All At Sea and Stepney Gets Lost
 * 58) Cinderella Ha-Ha - Thomas Stories: Happy Ever After and Thomas, Percy and The Squeak
 * 59) Dudley and the Knight Club - Thomas Stories: One Good Turn and Bulls Eyes
 * 60) The Great Dragonberry War - Thomas Stories: Heroes and Rusty and The Boulder
 * 61) The Boy Who Cried Witch - Thomas Stories: Haunted Henry and Duncan Gets Spooked
 * 62) The Pumpkin King - Thomas Stories: Thomas, Percy and The Dragon and Scaredy Engines
 * 63) Spooky Birthday - Thomas Stories: Toby's Discovery and Percy and The Haunted Mine
 * 64) Lullaby Dragon - Thomas Stories: Saved From Scrap and A New Friend For Thomas
 * 65) The Last Dudley - Thomas Stories: Oliver The Snow Engine and Not So Hasty Cakes

Trivia

 * A 65-episode crossover featuring the Pokemon Karaokemon ending segment.
 * Kimiko's outfits: from The Apprentice (in normal episodes), Screams of The Siren (in Winter episodes) and Treasure of the Blind Swordsman (in Halloween episodes).
 * Opening theme: the Shining Time Station theme.
 * Closing theme: a shortened version of Thomas' Anthem.