Publication history of Dick Grayson leadership of the Titans to Wonder Girl, and takes a leave of absence from the team. In pre-"Crisis on Infinite Earths" continuity, the maturing Dick Grayson grows weary of his role as Batman's young sidekick. He renames himself Nightwing, recalling his adventure in the Kryptonian city of Kandor, where he and Batman meet the local hero of the same name. "Nightwing: Secret Files & Origins" #1 and "Nightwing: Year One" tell the full post-Crisis version of how Dick Grayson gives up his identity as Robin (having been "fired" by Batman). Uncertain what to do with his new-found independence, Dick considers
Alternative versions of Robin The grief-stricken hero then kills Joker for revenge. Later, in the sequel "," Dick returns as a spirit after the Joker returns from Hell. He helps Batman defeats the Clown Prince of Crime once and for all, and gives Batman the strength to move on. Tiny Titans is a kiddie-based series follows the exploits of the Teen Titans (and other DCU character), as grade school kids attending school for Super-hero sidekicks. Dick Grayson's Robin is a primary character in the series, and often tries to act like the leader, although the rest of the Tiny Titans rarely listen to him.