South Park and Codename: Kids Next Door/Phineas and Ferb

Cast

 * Stan Marsh as Phineas
 * Numbuh 1 as Ferb
 * Wendy Testaburger as Isabella
 * Shelly Marsh as Candace
 * Heinrich Von Marzipan as Dr. Heinz Doofernshmirtz
 * Numbuh 5 as Vanessa Doofernshmirtz