Operation Ruthless / The Vacant Lot

S1 E7: Arnold decides to get up the nerve to speak with the girl of his dreams, Ruth McDougal, at the annual cheese festival. Helga learns of Arnold's infatuation and begins "Operation Ruthless" - every time Arnold attempts to approach Ruth, Helga spikes his plans. Arnold and the gang clean up a vacant lot so that they can have a baseball field, but the neighborhood adults have designs of their own for the newly renovated space.