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
Robin later informs Grayson that someone is masquerading as Batman, using similar weaponry to their own. Nightwing is later forced to rescue Damian after he is ambushed by Killer Croc and Poison Ivy. However, Nightwing's glider is shot down, and the two are forced to crash land into a skyscraper. In order to give Damian time to escape, Nightwing offers himself up to the hit squad that is after them. He is about to be shot when he is rescued in a hail of gunfire by the Batman impersonator.