What better time to be creative than a birthday? With gifts at stake, Phineas and Ferb are at their best. First they surprise Candace by adding her head to Mt. Rushmore, and then they cook up an even BIGGER surprise for their mom's birthday. With all these good intentions, what could possibly go wrong? Meanwhile, Dr. Doofenshmirtz has created a machine that will shrink everything he dislikes. Will this mean the end for Perry the Platypus?