Phineas and Ferb get trapped in an alternate dimension where the evil Doofenshmirtz rules the tri-state area. They must find a way back home with the help of their pet platypus named Perry, who they discover is a secret agent.
Phineas and Ferb turn the city of Danville into a giant thank you card for Santa Claus because they feel nobody ever thanks him for all the joy he brings to the world. Doofenshmirtz uses a device called the "Naughty-inator" to put the city of Danville on Santa's naughty list.
When an attack on the O.W.C.A. incapacitates the animal agents, only Agent P and his animal trainees can save the day. Carl and Monogram fend for themselves.
