14 Times Comic Book Movies Completely F*cked Iconic Villains
3. Doomsday (Batman v Superman)

In The Comics
He might have been beaten several times - mostly thanks to fiendish plots involving depowering him or weakening him with kryptonite - but Superman is billed as a God among men for good reason. He's basically immortal and for a long time, his writers had to rely on gimmicks to put him in peril.
But then his doomsday came in the shape of Doomsday, who would be the answer to the question of how you beat Superman in a straight fight. Honed through heinous evolutionary meddling, he was a monster created through generations of trauma, evolved specifically (by the writers at least) to kill Superman. He managed it, and quickly forced his way into the hall of fame for comic book villains in 1992.
On Film
Instead of his emotional, appalling origin from the comics, Batman v Superman's version of Doomsday is a vision of a school science project, mastered somehow by Lex Luthor stumbling on Kryptonian technology and General Zod's body. Don't pick at it too much, it falls apart.
He's a monster of the week, arriving with no prior billing, who rampages for a matter of minutes and then kills a weakened Superman thanks to a kryptonite assist, which is precisely the opposite of why he was created. Idiots.
He's a weapon literally pointed at the founders of the Justice League with no elegance and no underlying reason to want Superman dead other than the will of his master (in the comics, he's compelled to want Kryptonians dead for their treatment of him). And while he takes down Supes, he dies himself all too quickly and stupidly.