Season 4

After a young circus performer named Dick Grayson loses his parents to a criminal named Tony Zucco, Bruce Wayne adopts the young boy and, as Batman, tries to help him capture the crime boss who is responsible for killing his family.

After watching a movie about criminal masterminds, Penguin assembles an all-star team of Gotham's most dangerous villains to take down Batman. Meanwhile, Batgirl and Robin try to work together for the first time.

Clayface turns himself over to the police, promising to give up his criminal past and prove himself to Batman. And the arrival of a new villain might be the perfect opportunity to redeem himself.

When evidence from a series of art thefts by the Everywhere Man, a new costumed villain with the power to replicate, implicates Bruce's close friend John Marlowe, Batman believes there must be another explanation. Now, Batman must unmask the identity of the "Everywhere Man" and prove his friend's innocence.

After Batman apprehends Black Mask, his henchmen plan to spring him from Gotham P.D. so that Black Mask can activate his doomsday device. When Batman is captured, Batgirl and Robin must stop the villain on their own.

Hugo Strange infects the population of Gotham City with a deadly toxin that transforms everyone into zombies. Uninfected, Batman and Robin must race against time to find and distribute the antidote before the change becomes permanent.

A thousand years into the future, the citizens of new Gotham City are terrorized by a dangerous villain from the past. They must uncover the history of the Batman in order to defend themselves without him.

After a seemingly ordinary criminal continues to get the better of Batman and his partners it is discovered that he has the ability to travel back in time by several seconds. Batman is now faced with the seemingly impossible task of stopping a foe that knows his every move before even Batman himself does.

The Riddler and Batman are dropped at the bottom of Gotham Harbor where he discovers what role he played in the origin of the villainous Riddler. Batman must find a way to save them both from certain death.

After Batman takes down Punch and Judy, Joker takes an interest in the TV pop psychologist Harleen Quinzell and decides to groom her to become 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.

John Jones, a new officer in Gotham, claims to know the true identity of Batman. Batman must learn whether the officer is an ally or not. Meanwhile, Wayne Industries is distributing alien technology across the world.

Martian Manhunter's prediction of an alien invasion by The Joining has come true. After failing to save the city on his own, the Batman learns that even the greatest heroes have to sometimes rely on help.