The Batman

The Riddler and Batman are dropped at the bottom of Gotham Harbor ... and the Riddler reveals his origins.

When Harleen Quinzell is cancelled from her television program, Joker takes an interest and decides to groom her as his new partner in crime, Harley Quinn.

The villains of Gotham City are disappearing, each one defeated and captured by an invisible vigilante named Rumor. Batman and Robin must defeat Rumor before he has a chance to execute the villains.

Bruce discovers that Wayne Industries is distributing alien technology across the world, and gains the aid of a mysterious new ally.

Martian Manhunter's prediction of an alien invasion by The Joining has come true. As Batman tries to stop them on his own, he learns that even working with a team will stop The Joining.

Lex Luthor recruits Gotham villains to destroy Superman and the only ones who can save him are Batman and Robin. Part One of a two-part episode.

Luthor uses Poison Ivy's mind-control spores to take over Superman. Somehow Batman has to figure out a way to free him before Superman destroys the Dark Knight. Part Two of a two-part episode.

Green Arrow teams up with Batman when Couunt Vertigo, a villain who can affect people's sense of balance, arrives in Gotham with a diabolical plan to throw the entire city into a state of vertigo.

Firefly becomes even more powerful when an accident turns him into Phosphorus, a superhot villain who threatens a nuclear power plant.

Flash teams up with Batman when Mirror Master arrives in Gotham with a plan to trap everyone in their mirror images.

Batman, Robin and Batgirl go underground when the Joker uses the city's subway system to entrap Gotham citizens.