Ooh, Aah, & You/Phineas and Ferb

Cast

 * Ooh as Phineas
 * Aah as Ferb

Special Guest Stars from Octonauts

 * Tweak (from Octonauts) as Candace
 * Dashi (from Octonauts) as Isabella
 * Peso (from Octonauts) as Baljeet
 * Kwazii (from Octonauts) as Buford
 * Shellington (from Octonauts) as Jeremy
 * Captain Barnacles (from Octonauts) as Major Monogram
 * Professor Inkling (from Octonauts) as Carl
 * Tunip (from Octonauts) as Perry

Special Guest Stars from Peppa Pig

 * Peppa Pig (from Peppa Pig) as Gretchen
 * Suzy Sheep (from Peppa Pig) as Katie
 * Candy Cat (from Peppa Pig) as Holly
 * Rebecca Rabbit (from Peppa Pig) as Milly
 * Zoe Zebra (from Peppa Pig) as Adyson
 * Emily Elephant (from Peppa Pig) as Ginger