Doofenshmirtz is tired of not having a girlfriend so he makes and invention that turns the man into woman (The Change-Inator II) so he coul´d have more posibilities. Doofenshmirtz turns Perry into an atractive human woman and fall in love each other. And decide to marry. Meanwhile Phineas and Ferb find a platypus dead and beliving that it's Perry decide to make him a funeral.