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.
Nightwing
Later on, with the "Nightwing" miniseries (September 1995 to December 1995, written by Dennis O'Neil with Greg Land as artist), Dick briefly considers retiring from being Nightwing forever before family papers uncovered by Alfred reveal a possible link between the murder of the Flying Graysons and the Crown Prince of Kravia. Journeying to Kravia, Nightwing (in his third costume) helps to topple the murderous Kravian leader and prevent an ethnic cleansing, while learning his parents' true connection to the Prince.