Throughout the summer Phineas and Ferb and thier freinds had great adventures everyday, but when school is one day away, they're adventures may come to an end. Their only hope is to find the mystical stone of miracles, which is fortold to grant one wish, and wish for an endless summer, accompanied by their friend Isabella. Meanwhile, the housepet and secret agent Perry must stop long time nemisis Dr. Doofenshmirtz from finding the stone so that he may wish to rule the galaxy.