Oh, There You Are, Perry

When Phineas and Ferb think Perry is lost, they use the power of music to find him. Meanwhile, Candace, who fears she is at fault for Perry's disappearance, combs the Tri-State area to find him. As it turns out, Heinz Doofenshmirtz has been downgraded to a low-level threat and Perry has been reassigned to a more dangerous villain, and a new family.