Real Name: Mark Desmond
Occupation: Villain
Marital Status: Single
Base of Operations: Gotham City
Height: 7ft 4in
Weight: 645 lbs
Eyes: Brown
Hair: Brown
First Appearance: Detective Comics #345 (Nov. 1965)
Created By: Gardner Fox

The first Blockbuster was Mark Desmond, a chemist who wanted to become stronger. Experimenting on himself, he grew stronger and taller, but in the process was turned into a mindless brute. Desmond was cared for by his criminally-minded brother, Roland, who shielded Mark's monstrous appearance from their mother.

Roland used Mark to commit crimes until they were stopped by Batman and Robin. Desmond had years earlier been rescued from drowning by Bruce Wayne, and the Dark Knight Detective discovered that he could calm and stall the behemoth by removing his cowl and revealing his face. The sight did indeed calm the giant, preventing further destruction. Blockbuster sought solitude when free, only to find himself opposing the Caped Crusader on various occasions. He served as a member of the Secret Society of Super Villains during a battle with the Justice League. He was recruited by Amanda Waller's new Suicide Squad, and died battling Darkseid's creation Brimstone.