When preparing to take Perry for a walk, Phineas and Ferb realized that Perry was once again missing. Phineas suggested that they build a Perry for just such occasions. Ferb then produced a pre-made blueprint of a giant anamatronic Perry with flashing eyes, fiberglass bill and Judo flipping tail action.
Design and construction
Phineas and Ferb enlisted the help of Isabella, Baljeet and Buford in building the Perrytronic. It was given numerous capabilities, with the end result being that it would be capable of anything. At first, its only ability was that it could transform into anything that was big and made of metal. As she was pursuing a method called "Busy-Bee-Busting" at the time, Candace inspired them to install numerous other parts and functions, which would allow the Perrytronic to bake pie, train seals, and give change. The kids also decided to install a chicken incubator.
Having just finished his battle with Heinz Doofenshmirtz, Perry the Platypus fired a ray from the Duplicate-Inator-2 at the Perrytronic. The duplicated Perrytronic fell on the original's tail, causing the two giant robots to careen down the street.