Cast
- Phineas Flynn as Bert
- Ferb Fletcher as Ernie
- Genie (from Aladdin) as Big Bird
- Dr. Doofenshmirtz as Oscar the Grouch
- Garfield (from Garfield) as Cookie Monster
- Snoopy (from Peanuts) as Grover
- Perry as Rubber Duckie
- Candace Flynn as Zoe
- Gonzo (from The Muppets) as Count von Count
- Isabella Garcia-Shapiro as Prairie Dawn
- Stacy Hirano as Rosita
- Jeremy Johnson as Elmo
- Launchpad (from DuckTales) as Telly
- Baljeet as Baby Bear
- Vanessa Doofenshmirtz as Abby Cadabby
- Peanut the Elephant (from Beanie Babies) as Snuffy
- Tantor (from Tarzan) as Horatio the Elephant
- Heimlich (from A Bug's Life) as Slimey the Worm
- Big Mean Carl (from The Muppets) as Herry Monster
- Perry the Platypus as Barkley
- Giant Floating Baby Head as Baby Natasha
- Flash (from The Jim Henson Hour) as Hoots the Owl
- The Cat in the Hat (from The Wubbulous World of Dr. Seuss) as Guy Smiley
- Edd (from Ed, Edd 'n' Eddy) as Sherlock Hemlock
- Homer Simpson (from The Simpsons) as Forgetful Jones
- Fred Flintstone and Barney Rubble (from The Flintstones) as Two-Headed Monster
- Mr. Krabs (from Spongebob Squarepants) as The Amazing Mumford
- Buford Van Stomm as Frazzle
- Major Francis Monogram as Biff
- Carl Karl as Sully
- Spongebob Squarepants (from Spongebob Squarepants) as Murray Monster
- Gloria (from Madagascar) as Gladys the Cow
- Marty (from Madagascar) as Buster the Horse
- Lucy Van Pelt (from Peanuts) as Lulu
- Rabbit (from Winnie the Pooh) as Benny Rabbit
- Animal (from The Muppets) as The Big Bad Wolf
- Brother Bear, Sister Bear and Cousin Fred (from The Berenstain Bears) as The Three Little Pigs
- Ord, Cassie, Zak and Wheezie and Quetzal (from Dragon Tales) as Honkers
- Fozzie Bear (from The Muppets) as Dinger
- Kang and Kodos (from The Simpsons) as The Martians
- Tweety (from Looney Tunes) as Little Bird
- Norval the Fish (from The Wubbulous World of Dr. Seuss) as Mr. Johnson
- Suzy Johnson as Grundgetta
- Chicken Little (from Chicken Little) as Papa Bear
- Abby Mallard (from Chicken Little) as Mama Bear
- Maggie (from Maggie and the Ferocious Beast) as Curly Bear
- Suzy Sheep (from Peppa Pig) as Ovejita
- Riff (from Barney and Friends) as Stinky the Stinkweed
- Lambie (from Doc McStuffins) as Googel
- Hallie (from Doc McStuffins) as Phoebe
- Stuffy (from Doc McStuffins) as Narf
- Chilly (from Doc McStuffins) as Mel
- Numbuh 1 (from Codename: Kids Next Door) as Little Chrissy
- Numbuh 2 and Numbuh 4 (from Codename: Kids Next Door) as The Alphabeats
- Rolf (from Ed, Edd 'n' Eddy) as Little Jerry
- Kevin (from Ed, Edd 'n' Eddy) as Big Jeffy
- Jimmy (from Ed, Edd 'n' Eddy) as Chrissy
- Jonny (from Ed, Edd 'n' Eddy) as Rockin' Richard
- Huckleberry Hound (from Yogi Bear) as Maurice Monster
- Tom (from Tom and Jerry) as Harvey Monster
- Quincy (from Little Einsteins) as Kingston Livingston III
- Lawrence Fletcher as Humphrey
- Linda Flynn-Fletcher as Ingrid
- Peter Griffin (from Family Guy) as Bruno the Trashman
- Red Jessica (from Jake and the Never Land Pirates) as Sherry Netherland
- Sandy Cheeks (from Spongebob Squarepants) as Merry Monster
- Kion (from The Lion Guard) as Chicago the Lion
- Slippery the Seal (from Beanie Babies) as Wolfgang the Seal
- Princess Amber (from Sofia the First) as Roxie Marie
- Sam the Eagle (from The Muppets) as Placido Flamingo
- Dr. Teeth (from The Muppets) as Jackman Wolf
- Mr. Mischief (from Mr. Men) as Harvey Kneeslapper
- Meg Griffin (from Family Guy) as Deena
- Lois Griffin (from Family Guy) as Pearl
- Skully (from Jake and the Never Land Pirates) as Poco Loco
- Maleficent (from Sleeping Beauty) as Miss Finch
- Granny (from Looney Tunes) as Madame Chairbird
- King Roland II (from Sofia the First) as Daddy Dodo
- Queen Miranda (from Sofia the First) as Mommy Dodo
- Prince James (from Sofia the First) as Donnie Dodo
- Sofia (from Sofia the First) as Marie Dodo
- Mr. Happy, Little Miss Sunshine, Mr. Bump, Mr. Tickle, Mr. Strong, Little Miss Chatterbox and Little Miss Princess (from Mr. Men) as Board of Birds
- Bart Simpson (from The Simpsons) as Bug
- Mertle Edmonds (from Lilo and Stitch) as Grizzy
- Kermit the Frog (from The Muppets) as Stuckweed
- Tutter, Keisha, Luke, Lily, Rita and Moss (from Bear in the Big Blue House) as Pesties
- Mitch as Grouch Mayor
- Lefty the Donkey (from Beanie Babies) as Iago the Donkey
- Goatee the Goat (from Beanie Babies) as Lassie the Goat
- Rowlf the Dog (from The Muppets) as Don Music
- Floyd Pepper (from The Muppets) as Leo the Party Monster
- Miles Callisto (from Miles from Tomorrowland) as Roosevelt Franklin
- Phoebe Callisto (from Miles from Tomorrowland) as Roosevelt Franklin's Mother
- Yogi Bear and Boo-Boo Bear (from Yogi Bear) as Joey and Davey Monkey
- Hazel Charming, Posie and Lavender (from Little Charmers) as The Oinker Sisters
- Brittany, Jeanette and Eleanor (from Alvin and the Chipmunks) as The Squirrelles