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What will happen when Phineas and Ferb decide to build a ghost portal? What will happen when Danny ends up in their back yard because Phineas and Ferb opened said portal as Danny was passing by in the Ghost Zone. And what does Perry think of his new ghostly dog partner that Major Monogram paired him with in order to stop Doofenshmirtz's evil, ghostly, plans? Find out in today's crossover between Danny Phantom and Phineas and Ferb