3.9 5 4,132

Phineas and Ferb discover that Perry is a secret agent, and they all get stuck in an alternate dimension where Doofenschmirtz is the ruler of the tri-state area.

Phineas and Ferb, unaware that Doofenschmirtz aspires to being evil, help him to effect a portal to a parallel universe. In that universe, they discover a truly evil Doofenschmirtz who has conquered the Tri-State Area and rules with a robotic iron fist. Ultimately, Perry must form an alliance with the usual gang and their doppelgangers to save two Tri-State Areas.
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