Phineas and Ferb S02 E17 Oh, There You Are, Perry!

"We're getting the band back together!"

Perry the Platypus is reassigned and forced to move to the Quad State area with a new family and battle a new villain, the Regurgitator. During his new assignment, Phineas, Ferb, and Candace put in every effort to find him, hoping he'll return to them.