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 determined 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 a summer�s day can really be!Title Description: Phineas and Ferb Early Comic Reader #4: It's About Time!A tricky time machine turns an ordinary day of summer vacation into a struggle for survival when Phineas, Ferb, and Candace end up in the Jurassic period! The kids must avoid being trampled by Tyrannosaurus rexes and find a way to make it back to their own time, before mom and dad find out! Meanwhile, Perry the Platypus discovers that Dr. Doofenshmirtz has a brand-new nemesis--Peter the Panda!