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
Wrongfully blaming Nightwing for the death of his mother, the mob boss Blockbuster bombs Dick Grayson's apartment complex and promises to kill anyone in Dick's life. When the vigilante Tarantula arrives, Nightwing chooses not to stop her when she shoots the villain dead. He enters in a catatonic state after this action, and Tarantula takes advantage of his emotional trauma to rape him. At length, Nightwing shakes himself from his depression and takes responsibility for his inaction. He captures Tarantula and turns her and himself in to the police. Amy, however, feels the world needs Nightwing free and so prevents him from being charged.