Animations, Inc.

Cast

 * Lenny (Shark Tale) as James P. "Sulley" Sullivan
 * Rainbow Dash (My Little Pony: Friendship is Magic) as Mike Wazowski
 * Annie (Little Einsteins) as Boo
 * Dag (Barnyard) as Randall Boggs
 * Diesel 10 (Thomas and the Magic Railroad) as Henry J. Waternoose
 * Twilight Sparkle (My Little Pony: Friendship is Magic) as Celia Mae
 * Ariel (The Little Mermaid) as Roz
 * Tony and Fievel (An American Tail) as Needleman and Smitty
 * Cody (SML) as Fungus
 * Ferdinand The Bull (Ferdinand; 2017) as Yeti
 * Danny (Cats Don't Dance) as Thaddeus "Phlegm" Bile
 * Sally (Cars) as Ms. Flint
 * Sonic The Hedgehog (Sonic SatAM) as Ted Pauley
 * Genie (Aladdin) as George Sanderson
 * Iago (Aladdin) as Charlie
 * Wreck-it Ralph as Jerry
 * Dodo Birds (Ice Age) as the CDA
 * Discord (My Little Pony: Friendship is Magic) as Pete "Claws" Ward
 * Blaze, Darington and Pickle (Blaze and the Monster Machines) as Monsters with clipboards
 * Tanya (An American Tail) as Betty
 * Zoe and Vinnie (Littlest Pet Shop) as Small Monsters
 * Tiago, Bia and Carla (Rio 2) as Kid Monsters doing skipping ropes
 * Henry (Thomas and Friends) as Sneezing Fire Monster
 * Guido (Cars) as Tony
 * Donkey (Shrek) as Purple Slime Monster
 * Clifford (Clifford's Really Big Movie) as Franky
 * Benny (The Wild) as One-Eyed Assistant Monster
 * Johnny (Sing) as Slug Monster Assistant
 * Emmet (The Lego Movie) as Spike Slug Monster
 * Peter Rabbit (Peter Rabbit; 2018) as Orange Tentacle Monster
 * Tiger (An American Tail) as Blue Monster with Teeth
 * Ten Cents (TUGS) as Claws Ward's Assistant
 * Boco (Thomas and Friends) as Octopus Sushi
 * Aladdin and Jasmine (Aladdin) as Wife and Husband Monsters
 * Marty (Madagascar) as Camera Monster
 * Lightning McQueen (Cars) as Yellow News Monster
 * Mr. Krabs (SpongeBob SquarePants) as Purple Pink Monster
 * Surly (The Nut Job) as Yellow Slug Monster
 * Larry The Cucumber (VeggieTales) as Multiple Eyes Monster
 * Grover (Sesame Street) as Rectangle Yellow Orange Monster
 * Cholena (An American Tail: The Treasure of Manhattan Island) as Boo in Monster Disguise
 * Slinky (Toy Story) as Waxford
 * Ellie (Ice Age) as Monster Teacher
 * Young Ferdinand, Young Angus, Young Valiente, Young Bones and Young Guapo (Ferdinand) as Monster Kids