Phineas and Ferb/Captain Underpants

Cast

 * Phineas as Captain Underpants


 * Ferb as George


 * Perry as Harold


 * Thaddius as Melven Sneedly (Candace can't play Melven Sneedly because Candace is good and Melvin Sneedly is bad)


 * Dr. Heinze Doofensmertz as Mr. Keupp