Season X is a special season of Phineas and Ferb. It involves the future (like in Phineas & Ferb's Quantum Boogaloo) but with some changes.

Changes from the future from real P&F

  1. Doofenshmirtz was turned into Dr. Shadowshmirtz and lives in an alternate dimension called Dimension X (hence the season's name)
  2. Agent P is not old, and he ran away from the Flynn-Fletcher family reluctantly because he needed to go to Dimension X to stop Dr. Shadowshmirtz.
  3. adult Jeremy, adult Phineas and Ferb, elderly Dad, aunt Isabella, etc. appear
  4. Meap, Mitch, and the rest of the aliens appear regularly (more than Perry and Dr. Shadowshmirtz)
  5. Xavier and Fred have a pet named Carl the Cat, who is actually Carl the Intern who got turned into a cat by Mitch



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