Mayor Chickenen is the Mayor of Stumblegimp, Drusselstein. He visits Danville to meet with Mayor Roger Doofenshmirtz. Heinz Doofenshmirtz attempts to humiliate Roger by making Roger turn 90 degrees, showing his side to the Mayor. Since showing one's side is considered an insult in Stumblegimp, Chickenen declares war, but not before Roger dances the new and improved Stumblegimpian Humiliating Dance of Contrition, foiling Heinz's scheme.
Until the end of the episode, Doof didn't know his name.