The Spelling Bee / Pigeon Man

S1, E15: Arnold and Helga are chosen to represent the school in the city wide spelling bee. Arnold has serious plans for the $500 prize money, but Helga has other ideas. Arnold takes one of his sick pigeons to the mysterious Pigeon Man who miraculously cures the bird. To show his gratitude, Arnold convinces the Pigeon Man to come down off his roof and walk around the old neighborhood.