The most elaborate Easter egg in Batman V Superman: Dawn of Justice might be one that most of the internet missed until last week.
A Facebook Superman fan page posted a video, embedded below, providing a side-by-side comparison of General Zod's murder of Jor-El at the start of 2013's Man of Steel and Superman's death at the hands of Doomsday in this year's blockbuster.
The similarities are too close to be accidental, particularly when you consider that Batman V Superman was directed by Man of Steel helmer Zack Snyder and that Doomsday, in the mythology of DC's extended universe, was bio-engineered from the corpse of Zod himself.
You can check it out below.
The death of Jor-El came toward the beginning of Man of Steel and it was only much later that Jor-El's grown son, Superman, would learn that it was Zod who killed him. The parallel between the two could probably speak to instincts that Doomsday was still feeling even though he was essentially mindless killing machine.
Other examples could be the moment when he uses heat vision for the first time -- somewhat reminiscent of when Zod did, which is something referenced at the beginning of Batman V Superman -- and the monster's reaction when it first sees the statue built to honor Superman and the people who died during Zod's attack in Man of Steel.
The notion of multiple versions of Zod or Zod-like abominations isn't a new one for the movie. In the pre-Crisis on Infinite Earths DC continuity, Zod had an army of "bizarros" -- imperfect clones of himself -- that worked under him on Krypton. The concept of a "Bizarro" is generally one that's applied to Superman, but the idea of an imperfect, mindless clone of Zod is obviously one that was repeated in Doomsday.
In the comics, Doomsday wasn't a clone of Zod, but of his own creator, Bertron, who sought to create the perfect living weapon by making a clone, killing it, collecting the genetic tissue, cloning it again, and hoping to "fast-evolve" a being by necessity. It worked, but (as in Batman V Superman) when Doomsday finally emerged in his final state, he immediately turned on his creator.
Because Bertron's world was a pre-historic Krypton, and because Superman later killed Doomsday during their first battle, the beast would eventually become obsessed with hunting and killing Kryptonians above all else -- something that was a danger to Superman's son, Jonathan, in recent issues of Action Comics.