Hide and Seek

When [Phineas and Ferb play a game of indoor "hide and seek", the boys shrink down their friends including their extreme fan, Irving. Then Candace tries to bring the shrinking machine to Linda to bust them. Meanwhile, Dr. Heinz Doofenshmirtz attaches a nanobot to Perry in an attempt to discover where he lives, and sees Phineas, Ferb, Isabella, Buford, Baljeet and Irving while doing so.