Nightwing
Although Nightwing is commonly associated with Batman, the title and concept have origins in classic Superman stories. The original Nightwing in DC Comics was an identity assumed by alien superhero Superman when stranded on the Kryptonian city of Kandor with his pal Jimmy Olsen. Drawing inspiration from Batman and Robin, the two protect Kandor as the superheroes Nightwing and Flamebird. Following the Crisis on Infinite Earths continuity reboot in 1985, Nightwing was re-imagined as a legendary vigilante from Krypton whose story inspires Dick Grayson's choice of name when he leaves behind his Robin identity.
Publication history of Dick Grayson
In order to help himself regain a sense of purpose, Nightwing opted to stay in New York City again, and play the role of the city's protector. He takes on a job as a museum curator; and uses the museum as his new base of operations. During his short time there, Dick finds himself once again confronted with Two-Face, who years ago delivered Dick's greatest defeat. This time however, Dick soundly defeats Two-Face.