Nightwing was an alias used by Superman in storylines that took place in Kandor, a Kryptonian city that was preserved in a bottle. He first appeared in the comics in 1963, but was later reimagined, and the persona was taken on by Dick Grayson as a vigilante character after he left behind "Robin".
The film is being written by Bill Dubuque, who wrote "The Accountant". His credits also include "The Judge" and "A Family Man".
Warner Bros. is staying busy with their lineup of DC Extended Universe films. Soon to be released are "Wonder Woman" on June 2, "Justice League," opening Nov. 17; and "Aquaman," starring Jason Momoa and opening Oct. 5, 2018.
