At this meeting, the signal is partially destroyed when Batman is attacked by a Harvey Bullock duplicate, and Barbara uses Batman's grapple gun to pull the robot into the signal, electrocuting it. Likewise, the real Bullock uses the signal for the first time when reluctantly asking for Batman's help in discovering who is trying to kill him in "A Bullet for Bullock". The first use of a Bat-Signal of any kind in the series was in "Joker's Favor", where a man, forced to do a favor for the Joker at a dinner honoring Commissioner Gordon, uses a large bat model hanging from a crane, swinging it back and forth in front of a window to try to contact Batman.