Signalman is a supervillain appearing in American comic books published by DC Comics. He is a member of Batman's rogues gallery.

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.