Blockbuster is the name of three fictional character in the DC Comics Universe. The first one was primarily a foe of Batman and Robin, while the second frequently fought Nightwing, formerly Robin. The latest Blockbuster first appeared in the pages of the series 52 wherein he is directed into battle against Lex Luthor's team of superheroes, Infinity Inc.
The first Blockbuster was Mark Desmond, a chemist who desired to increase his physical strength. Experimenting on himself, he succeeded in making himself stronger and taller, but as a side-effect of the process he also became almost mindlessly aggressive. The mentally debilitated Desmond was cared for by his brother Roland, a local criminal, who kept their mother from discovering what Mark had done to himself.
Roland manipulated his brother into committing crimes on his behalf until they came into conflict with Batman and Robin. Bruce Wayne had once rescued a young Desmond from drowning, and he discovered that he could calm the enraged adult Desmond by removing his cowl, showing him his face. Desmond later found himself clashing with Batman on various occasions. He joined the Secret Society of Super Villains briefly for a battle with the Justice League. Later, Amanda Waller recruited Desmond for her revived Suicide Squad. He was killed fighting Darkseid's creation Brimstone.
Roland Desmond became the second Blockbuster after a severe illness forced him to be treated with experimental steroids. Like his brother Mark, Roland became a child-minded super-strong monster. He ran wild in the Southwest, but Batman and Starman brought his rampage to an end.
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Official Site: D.C Comics
Links: Wikipedia Un. Guide to the D.C Universe Titans Tower