Doomsday

You might think that it would be best to save Doomsday for a “Death of Superman” movie in the not-too-distant future but, that’s the thing with Doomsday, when he’s been defeated once it doesn’t mean he’s gone for good.
In fact, if Doomsday was to appear in Batman v Superman: Dawn of Justice – only to be defeated by the likes of Batman, Superman and Wonder Woman – his comic book powers suggest he would evolve and return later with immunity to the methods used to defeat him in the first instance.
Doomsday first appeared on panel in 1992 and he has proven to be a thorn in Superman and his allies’ side ever since. A Kryptonian monster, he possesses immense super-strength and durability, as well as a number of sharp, bony protrusions that can be used as weapons.
There are rumours that Jesse Eisenberg’s Lex Luthor will use the corpses of General Zod and his allies from Man of Steel to create the monster, so don’t rule out an appearance from him in BvS.
