Blockbuster is the name of four supervillains and a criminal organization appearing in American comic books published by DC Comics. The first iteration was an adversary of Batman and Robin, while the second served as one of Nightwing's greatest enemies. The latest version first appeared in the pages of the series 52 wherein he is directed into battle against Lex Luthor's team of superheroes.

Richard "Dick" Grayson is a superhero appearing in American comic books published by DC Comics, commonly in association with Batman, Teen Titans and Justice League. Created by writer Bill Finger and artist Bob Kane, he first appeared in Detective Comics #38 in April 1940 as the original and most popular incarnation of Robin, Batman's crime-fighting partner. He is also the oldest child of Bruce Wayne, Batman's alter ego, being the first child to be adopted by Batman. In Tales of the Teen Titans #44, the character, after becoming a young adult, retires his role as Robin and assumes the superhero persona of Nightwing. Grayson has donned the cape and cowl to replace Bruce Wayne as Batman. His most notable spell as Batman followed Bruce Wayne's supposed death in Final Crisis, and sees Grayson adopt Damian Wayne, Bruce's biological son and his adoptive younger brother, as his Robin.