In rhyming text based on "The Night Before Christmas, " Agent P diligently works to save the holiday from Dr. Doofenshmirtz and return home before Phineas and Ferb wake up on Christmas morning.
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.
When Phineas and Ferb take a time machine twenty years into the future, they meet a grown-up Candace, still determined to get them in trouble, who goes back into the past to stop them, as Perry the platypus continues to battle Dr. Doofensmirtz.