Candace finds a rabbit outside of her house and decides to take care of it. However, the rabbit is actually Dennis; a former O.W.C.A. agent who went rogue and is on a mission to infiltrate Perry's lair and steal the system of the O.W.C.A. Meanwhile, Phineas and Ferb purchase some X-ray Glasses, and then when they feel that they have been ripped off, they build their own pair. The glasses then give them the idea to help others. Elsewhere, after realizing that Perry the Platypus isn't showing up, Dr. Doofenshmirtz decides to create Planty the Potted Plant to replace Perry. His plan was to induce all of the dogs in the apartment next to his building away so that he wouldn't be annoyed by the noise they make.