A mysterious villain known as the Riddler challenges Yin, secretly helped by Batman, to a number of riddles. Things are not what they seem from the riddles...

Firefly and Mr. Freeze team up to put their devastating plan into action: permanently putting Gotham City in a never-ending winter. Once the policeman's gala charity ball is put on ice, it's all up to the Batman.

The Joker decides to take on the role of "Batman" and doses Bruce with Joker venom to create an arch-rival of his own.

Killer Croc, a half-man, half reptile plans to submerge all of Gotham in water in order to facilitate his plundering of the city.

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.

Ethan Bennett is captured and put on trial for his crimes as Clayface. He's released on probation but he may find the temptations of a criminal life too great.

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!

Ragdoll, a triple-jointed contortionist, crosses paths with Batman and Catwoman while continuously trying to steal priceless artifacts. Also, Selina Kyle befriends Bruce Wayne ... but what are her intentions?

Spellbinder, a three-eyed mystic with the ability to induce both hypnosis and visions employs the servants of the rich to steal the Eye of Sarkana -- including Alfred!

Solomon Grundy, a legendary zombie, emerges from a swamp on Halloween to wreak havoc on Gotham. But Batman and Alfred discover that there is more to Grundy than there appears.

Joker takes Detective Yin hostage, but once captured he refuses to tell of her whereabouts. Convinced it's the only way to learn Yin's location before she meets her demise, Batman uses a device created by Professor Hugo Strange to enter the bizarre brain of the Joker in search of an answer.

Joker, Penguin, and Riddler battle over control of the city, until finally deciding to settle their differences by giving all of Gotham over to whoever is able to capture and discover the true identity of the Batman.