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.
Batman: Night of the Owls
While Nightwing fights the demon Zohna in New Orleans, his girlfriend Raya meets up with Saiko. Saiko reveals that he knows about the Black Book of Names and sleeps with Raya, revealing himself to be none other than Nightwing's childhood friend, Raymond. Nightwing grows confused as to why Saiko has not attacked him and investigates the case, using his skills learned from his tenure as Batman. With Bruce still missing, Nightwing learns of a Flying Grayson's Memorial Show planned in Gotham. Saiko reveals to Raya that he plans on killing Grayson at the memorial show. At the show, Nightwing confronts Saiko who, to Grayson's shock, reveals himself as Raymond. Because before Bruce took him in, Grayson was supposed to be the next Talon, in turn, Raymond blames him for the torture that he received. During the fight, Saiko triggers explosions around the circus.