Where's My Perry, and to a Further Extent, my Water? is the 11th episode of Season 31 on Disney and the 25th on Nickelodeon. There is a water shortage in Danville and it's because of Doofenshmirtz, so Perry has to leave to house in the middle of the night and Phineas and Ferb are left clueless to where he is, so the boys go to find Perry as Perry tries to find all the town's water.