<P> Grayson moves to New York, where he works closely with the Outsiders . After "insiders" threaten both the Outsiders and the newest incarnation of Teen Titans, however, Nightwing realizes that the team has gotten "too personal" and quits . </P> <P> Due to a crisis of conscience, Dick adopts the new villainous persona of Renegade in order to infiltrate Lex Luthor's Secret Society of Super-Villains . This ruse includes Nightwing aligning himself with his long - time enemy Deathstroke in order to track the manufacturing and distribution of Bane's venom serum and to keep tabs on the Society's activities in Gotham and Blüdhaven . He also begins training (and subtly converting) Deathstroke's daughter, Ravager . </P> <P> Deathstroke takes revenge on Nightwing when Blüdhaven is destroyed by the Society . The Society drops the super villain Chemo on the city, killing 100,000 people . Dick tries to rescue survivors but is overcome by radiation poisoning; only to be rescued himself by Batman . Nightwing confides that he let Blockbuster die and asks Batman to forgive him . Batman tells him that his forgiveness doesn't matter; Dick has to move beyond Blockbuster's death . Inspired by his mentor, he proposes to Barbara Gordon, who accepts his proposal with a kiss . </P> <P> Batman then entrusts Nightwing to alert other heroes about the danger that the Crisis poses . Dick flies to Titans Tower, but due to the chaos resulting from the Blüdhaven disaster, the OMAC onslaught and other Crisis related events, the only hero who answers his call is Conner Kent . Together, they locate and attack Alexander Luthor's tower, the center of the Crisis, only to be repelled by Superboy - Prime . Prime is ready to kill Nightwing when Conner intervenes, sacrificing himself to destroy the tower, ending the destruction of the Universe . </P>

When does robin become nightwing in batman the animated series