Phineas and Ferb think that there olld toys are boaring so they thaught of the idea to make them life size and actuly do what they're supose to (Such as a super hero action figure can now actuly fly and has super streanth) Also, a new kid named Monty comes and helps them build there "Big Idea". Wile they do that, Doofenshmirtz is selling his old "Inators" at a flee market.