Scooby-Doo and the Mystery Inc. gang meet up with Batman and other friends to defeat evil villains and save the day.

Batman works desperately to find a bomb planted by the Joker while Amanda Waller sends her newly-formed Suicide Squad to break into Arkham Asylum and recover vital information stolen by the Riddler.

Batman and Nightwing are forced to team with the Joker's sometimes-girlfriend Harley Quinn to stop a global threat brought about by Poison Ivy and Jason Woodrue, the Floronic Man.

Batman, Batgirl, and Robin forge an alliance with the Teenage Mutant Ninja Turtles to fight against the Turtles' sworn enemy, The Shredder, who has apparently teamed up with Ra's Al Ghul and The League of Assassins.

Batman discovers a mysterious teen-aged girl with superhuman powers and a connection to Superman. When the girl comes to the attention of Darkseid, the evil overlord of Apokolips, events take a decidedly dangerous turn.

Mary Smith, a young girl who lives with her great-aunt in the countryside, follows a mysterious cat into the nearby forest where she finds a strange flower and an old broom, none of which is as ordinary as it seems.

Andrea Beaumont leaves her father to return to Gotham, rekindling an old romance with Bruce Wayne. At the same time, a mysterious figure begins to hunt down Gotham's criminals, wrongly implicating Batman in the murders. Now on the run from the law, Batman must find and stop the culprit, while also navigating his relationship with Andrea.