Wow! Wow! Wubbzy!/Phineas and Ferb

Cast

 * Wubbzy as Phineas
 * Walden as Ferb
 * Widget as Candace
 * Daizy as Isabella
 * Birdy Bird as Perry
 * Buggy as Baljeet
 * Earl as Buford
 * Huggy as Stacy
 * Sparkle Town Fairies (from Sparkle Town Fairies) as The Fireside Girls
 * Old Fingerhead (from Ratboy Genius) as Dr. Doofenshmirtz
 * and more

Version 2

 * Wubbzy as Phineas
 * Walden as Ferb
 * Widget as Candace
 * Daizy as Isabella
 * Birdy Bird as Perry
 * Buggy as Baljeet
 * Earl as Buford
 * Huggy as Stacy
 * Female Modern Nick Jr. Characters as The Fireside Girls
 * Mr. Grumpfish (from Bubble Guppies) as Dr. Doofenshmirtz
 * and more

Version 3

 * Wubbzy as Phineas
 * Walden as Ferb
 * Widget as Candace
 * Daizy as Isabella
 * Huggy as Stacy
 * Buggy as Baljeet
 * Earl as Buford
 * Birdy Bird as Perry
 * Kooky Kid as Dr. Heinz Doofenshmirtz
 * Gil (from Bubble Guppies) as Jeremy
 * Molly (from Bubble Guppies) as Jenny
 * Oona (from Bubble Guppies) as Katie
 * Leah (from Shimmer and Shine) as Ginger
 * Ruby (from Rusty Rivets) as Adyson
 * Gabby (from Blaze and the Monster Machines) as Gretchen
 * Nella (from Nella the Princess Knight) as Holly
 * Sunny (from Sunny Day) as Milly
 * Shine as Vanessa