Nothing's impossible for Phineas and Ferb! When school's out for the summer, the stepbrothers plan all kinds of exciting and fantastic adventures for each day of vacation. Soup up Mum's car and enter the Swampoil 500 Race? No problem! Form a rocking band and become a one-hit wonder? Sure! Rebuild a time machine and bring back a T-rex? Excellent! Meanwhile, their big sister Candace is going nuts trying to bust them to Mum and Dad, and their pet platypus is leading a double life as "Agent P," who is secretly saving the world from Dr. Doofenshmirtz's evil plots. If they can imagine it, they can do it — and Phineas and Ferb are gonna do it all!