There’s 104 days of summer vacation and today you get a full episode to celebrate! Phineas and Ferb try to locate their parents' favorite band, Love Händel, to perform a reunion concert in the backyard! Meanwhile, Dr. Doofenshmirtz plans a surprise birthday party for his daughter and for the grand finale...he wants to launch Perry the Platypus on a giant firecracker!
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Phineas and Ferb invent, scheme, and stay one step ahead of their sister Candance who just wants to catch them up to no good! Their pet platypus Perry lives a double life as a secret agent whose sole mission is to foil Dr. Doofenshmirtz's plans.