Set one year after the events of season two. Dick and Barbara are now getting ready to graduate from high school and while Barbara is fine and has decided to stay in Gotham and continue crime fighting as usual, Dick is uncertain about his future, he is wanting to go to college and wants to escape Batman’s shadow and prove himself a hero in his own right but Bruce expects him to stay in Gotham and continue as partners. While this is happening the crime boss Sal Maroni escapes from prison and sets his sights on the man who put him away, the now DA Harvey Dent. Maroni kidnaps Dent and plans to murder him but Batman arrives before they do, but in the chaos and gunfire Harvey is knocked over into a pool of acid, burning and disfiguring half of his body- and mind. This event turns him into the villain Two-Face, and he blames Batman for his condition, Dent also makes the discovery that Batman is his best friend Bruce Wayne and he kidnaps Wayne’s daughter Helena and threatens her. I’m the midst of this, Dick is told a story of an old vigilante from Blüdhaven by Lucias Fox, the vigilante’s name is Nightwing and Fox encourages Dick to leave and become his own man, and hero, and even makes him a new suit to represent this new identity. So despite Bruce’s feelings about Dick leaving, they must put their differences aside in order to save Bruce’s daughter and defeat his former friend.