Penguin discovers a sonic device that allows him to turn Man-Bat into his personal slave. Meanwhile, Alfred must deal with a raccoon which has found its way into the Bat-Cave and is wreaking havoc on the electric equipment.

Joker pirates the airwaves of Gotham in order to broadcast his crimes on TV as entertainment. When Detective Yin's overzealous new partner tries to bring the clown prince of crime down, he merely becomes Joker's latest "co-star." Batman must find where Joker is broadcasting from before he can carry out his plan to make Gotham die of laughter!