The Day Phineas Flynn was born

Ferb, Candace, Isabella, Bailjeet, Buford, Irving, Brendan and The Fireside Girls is shocked to learn that Phineas has got illness and is dying! Now,  Ferb, Candace, Isabella, Bailjeet, Buford, Irving, Brendan and The Fireside Girls must find a way to save Phineas before it's too late! But disaster strikes however when Ferb, Candace, Isabella, The Fireside Girls and Bailjeet gets illness as well and is also dying so Brendan, Buford and Irving must save them and Phineas. Meanwhile, Doofenshmirtz must find a way to cheer Perry up.

Plot
Brendan, Ferb, Candace, Isabella, Buford, Bailjeet, Irving and The Fireside Girls is worried about Phineas who has got illness.