Candance quiere fastidiar a los chicos, pero su otra personalidad le pide estar con Jeremy y su nuevo invento; Phineas y Ferb se quedan en casa por enfermedad.
Della, Dewey and Huey require the help of a brazen pilot to visit an island of monsters to investigate a mystery, but Don Karnage remains in close pursuit.
Bill and Chip Whistler strike up a friendship as the Green family attends Farm Con; Cricket becomes $100 richer and is convinced to use it for an investment.
Young Bill is determined to ensure the family farm remains in business; Tilly and Nancy try to sit next to an important person at Saxon's birthday party.
Tilly accepts an opportunity to test new technology at BigTech; Cricket is forced to choose whether he should bring Tilly or Remy with him to attend a show.
Luz observes a part of the Hexide School she had not come to expect after Gus helps her sneak inside for a presentation at the Human Appreciation Society.
A research station is in jeopardy, so the team ventures into space to protect it; Hamster takes on an undercover mission to thwart a criminal organization.
Gretel wants to hang out with the cool kids but has to protect them from a disgraced mascot; Kevin and Anthony's friendship is threatened by a prank show.
Mabel y su hermano se enredan en una misión para encontrar al criminal que se metió con la estatua de cera y Grunkle Star lamenta la pérdida de su réplica.
Barry's brother skips class, so Kiff and Barry try to discover where he goes; Kiff and Barry want to help the citizens of Table Town through their summer jobs.
Helen is the only person able to help when Kiff unleashes five forces of chaos; Kiff has a difficult talk with Barry about finishing Martin's orange juice.
Dr. Doofenshmirtz se une a Candace y Jeremy; Phineas y Ferb construyen un perro robot enorme que causa problemas; Phineas y Ferb construyen un biodomo gigante.
El experimento 251 es activado accidentalmente y comienza a unir a la gente que encuentra con una cuerda pegajosa, junta a Lilo y Mertle, Jumba y Pleakley, etc.