Main Plot: Candace's plans to watch over Phineas and Ferb backfire when Dr. Doofenshmirtz's "Babe-inator" turns her brothers into babies. Sub-plot 1: After having an epiphany, Dr. Doofenshmirtz shows up at the OWCA to give up his evil ways. Agent P has no choice but to show Dr. Doofenshmirtz the ropes of the trade, but things quickly sour between the two after Dr. Doofenshmirtz accidentally exposes the identity of a fellow animal agent. Sub-plot 2: Hiro was fired from his summer job as a waiter, now he feels like all hope is lost, can Katy cheer him up by a adventure that could cost her, her secret agent job at O.W.C.A? Note: I Only Own My OCs. Note: Season 4, Episode 21.