Phineas and Ferb As The Prince and the Pauper

Phineas is a boy living on the streets, forced to steal for food, Prince Ferb is the son of a recently deceased king, who's not looking forward to taking on royal responsibilities. When these two boys are fated together they take an intrest in eachother's lives and decide to switch identities. At first Phineas loves the pampered life of a prince, but soon the responsibility of ruling a country is to much for him. Meanwhile, Ferb learns that what seems as a care-free life, is actually a struggle for survival. To make matters worse, the evil royal advisor, Doofenshmirtz, is out to kill Phineas, mistaking him for Ferb.