Just Squidding

Series Description:
Best friends and stepbrothers Phineas and Ferb are determined to make each mind-numbing rotation of Earth into something special. But their sister, Candace, is relentless in her efforts to reveal their crazy endeavors to their mom. Meanwhile, Perry the Platypus—Agent P—is called on repeatedly to save the world from the dangerous Dr. Doofenshmirtz. Spend some time with Phineas and Ferb and see just how exciting and outrageous life can really be!
Title Description:

It's just another awesome day of summer vacation for Phineas and Ferb, and this time they're ready for an aquatic adventure! The stepbrothers decide to build a giant mechanical squid and travel to the depths of Danville's deepest lake to look for buried treasure. Meanwhile, Dr. Doofenshmirtz has built his own underwater creature to try to defeat Agent P—and the tri-state area —once and for all! But when Phineas and Ferb's squid runs into Dr. Doofenshmirtz's invention, will it be a friendly encounter? Or will this day turn into an underwater disaster?