Major Monogram and Dr. Heinz Doofenshmirtz count down a list of the top ten fan-favorite songs from Phineas and Ferb, per viewer's votes on the Internet.
Phineas and Ferb travel in time to find a tool that hasn't been invented, but when future-Candace follows them back in time, history may changed forever.
Cricket is challenged to a high-dive jump when his family goes to an indoor pool; Tilly claims their goat has a dog's spirit so it can compete in a dog show.
A relaxing game night becomes tense when the family is forced to deal with a barbaric civilization, shrink rays and a dangerous level of competitiveness.
Sprig and Polly ignore warnings from Annie and Hop Pop and driving at night; the Plantars realize they forgot to get gifts from their trip to Newtopia.
Gloria and the Greens are forced to spend time in close quarters when they get stuck in an elevator; Remy succumbs to the effects of an internet influencer.
Chip Whistler comes back for vengeance against Cricket and the Greens; Tilly and Andromeda assume they are invited when Gloria reveals plans for a night out.
Remy and Cricket decide to start up a heated game of "H-O-R-S-E" on the hottest day of the year; Cricket is on the verge of enduring a brutal punishment.
Bill realizes that his favorite comic might not be who he claims to be, and Cricket takes on a comic who specializes in insults; Tilly defends Cricket.
The Greens get quite the work out at Big City's newest gym; Cricket finds a loophole in his curfew that will allow him to go to a late-night drone show.
A convenience store's "No Shoes, No Service" policy stops Cricket in his barefooted tracks; Bill struggles to keep Remy's surprise party for Vasquez a secret.
The Bladers of X City are excited for a Star Battle; Tenka asks Ekusu Kurosu for help to defeat Omega; Persona also decides to take part in the Star Battle.
Doofenshmirtz is sentenced to teach science at his daughter's school for community service; Doof tries to locate a lawn gnome to patch things up with his dad.
Merian tries to save Dr. Lullah's poor fish counter from a life of busy work; the kids put on a stage play to warn the mutants of an incoming disaster.
Kiff reads a popular book series and tries to avoid spoilers about the plot; Helen starts a new business selling healthy muffins, so Kiff and Barry help out.
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.
Phineas and Ferb decide that it is a good idea to create a mechanical adaptation of the historical shark of Danville Harbor at the Harbor Days Festival.
Phineas and Ferb put together a portal, and Candace unintentionally goes inside of it and reduces in size; Phineas and Ferb manufacture an enchanted carpet.
Louie finds himself defending his uncle against Doofus Drake after Scrooge learns from his nemeses how he is the direct cause of their descent into evilness.
During a trip to Scrooge McDuck's mansion, Huey, Dewey and Louie accidentally send the family on an adventure through the mythical lost city of Atlantis.
Ivy becomes fed up with following her mother's strict rules and decides to run away; Anne exposes old secrets after asking Hop Pop to get the music box.
Marcy, Anne and the rest of the Plantar family visit an ancient temple, where they must survive deadly challenges in the hopes of returning Anne and Marcy home.