"Phineas and Ferb know that when you want to make every day count, birthdays are the perfect excuse to do something extra wild!"--p. [4] of cover.

Phineas and Ferb celebrate the fifth anniversary of their pet platypus, Perry, with a platypult, but their creation causes them to end up in Dr. Doofenshmirtz's lair where they unknowingly help him launch the Other- Dimensionator, which zaps Phineas and Ferb into a new world where the face their alternate selves and even an alternate Dr. Doofenshmirtz.

Candace has always known that her brothers are a little weird, especially Ferb, who never seems to talk. But after watching an all-night science-fiction movie marathon, she's convinced that Ferb is actually an alien! Can Candace prove her brother is really from another planet?

Cirque du Lune is in town, and Phineas and Ferb can't wait to see the the show. Then it's cancelled, so they put on their own circus.

Set sail with Phineas and Ferb for an island adventure.

After seeing a museum exhibit about ancient Greece, Phineas and Ferb decide to challenge Buford Van Stomm to a chariot race.

It's all fun and games when Phineas and Ferb create a swimming pool full of gelatin ... until Dr. Doofenshmirtz's latest creation brings it to life! Phineas and Ferb have to find a way to stop the giant gelatin monster and save Candace. (Nothing but trouble). What happens when the boys accidentally knock a UFO off its course, causing it to crash in their backyard? And when will they meet its pilot, the adorable Meap? (The chronicles of Meap).

It's summer vacation for Phineas and Ferb, and they have a lot to do! First, they fix up their mom's car and enter the Swamp-Oil 500 at the speedway. Then, they build a wild roller coaster.