Nick Jr./Phineas and Ferb

Cast

 * stave from blues clues as Phineas Flynn
 * The Cat in the Hat (from The Wubbulous World of Dr. Seuss) as Ferb Fletcher
 * Mrs.peeper from blue clues as Candace Flynn
 * Max (from The Wubbulous World of Dr. Seuss) as Perry the Platypus
 * Swiper (from Dora the Explorer) as Dr. Doofenshmirtz
 * Daizy (from Wow! Wow! Wubbzy!) as Isabella Garcia-Shapiro
 * Benny the Bull (from Dora the Explorer) as Buford van Stomm
 * Little Bill (from Little Bill) as Baljeet
 * Diego (from Go, Diego, Go!) as Jeremy Johnson

Version 2 (Caitlin Reece Alex Francisco)

 * Wubbzy (from Wow! Wow! Wubbzy!) as Phineas
 * Walden (from Wow! Wow! Wubbzy!) as Ferb
 * Widget (from Wow! Wow! Wubbzy!) as Candace
 * Daizy (from Wow! Wow! Wubbzy!) as Isabella
 * and more!

Version 3

 * Gil (from Bubble Guppies) as Phineas
 * Nonny (from Bubble Guppies) as Ferb
 * Sunny (from Sunny Day) as Isabella
 * Katie (from PAW Patrol) as Candace
 * Molly (from Bubble Guppies) as Stacey
 * Mayor Humdinger (from PAW Patrol) as Doofenshmirtz
 * Goby (from Bubble Guppies) as Baljeet
 * Ryder (from PAW Patrol) as Jeremy
 * Rusty Rivets as Buford
 * Roxy (from Sunny Day) as Gretchen
 * Nella The Princess Knight as Milly
 * Ruby Ramirez (from Rusty Rivets) as Katie
 * Deema (from Bubble Guppies) as Holly
 * Oona (from Bubble Guppies) as Ginger
 * Gabby (from Blaze and the Monster Machines) as Adyson
 * Shimmer (from Shimmer and Shine) as Jenny
 * Hazel (from Little Charmers) as Vanessa
 * and more

Version 4

 * Gil (from Bubble Guppies) as Phineas
 * Nonny (from Bubble Guppies) as Ferb
 * Sunny (from Sunny Day) as Isabella
 * Katie (from PAW Patrol) as Candace
 * Molly (from Bubble Guppies) as Stacey
 * Mayor Humdinger (from PAW Patrol) as Doofenshmirtz
 * Goby (from Bubble Guppies) as Baljeet
 * Ryder (from PAW Patrol) as Jeremy
 * Rusty Rivets as Buford
 * Gabby (from Blaze and the Monster Machines) as Gretchen
 * Leah (from Shimmer and Shine) as Milly
 * Oona (from Bubble Guppies) as Katie
 * Ruby Ramirez (from Rusty Rivets) as Holly
 * Shine (from Shimmer and Shine) as Ginger
 * Deema (from Bubble Guppies) as Adyson
 * Milli (from Team Umizoomi) as Jenny
 * Hazel (from Little Charmers) as Vanessa
 * and more