Summary

Phineas and Ferb finally discover that their beloved platypus Perry is a real secret agent. They join him on a grand adventure that blasts them to another dimension where a truly evil Dr. Doofenshmirtz has joined forces with "Platyborg" to rule over an alternate Tri-State Area. Now the gang must face Dr. Doofenshmirtz and play dimensional hopscotch to make it back home.