Originally posted by deathslash
That will forever be the one piece of lore about Doomsday that makes it impossible to suspend my disbelief. He can apparently think and show cruelty, but somehow doesn't have a brain? He can get killed by being beat to death, but somehow doesn't have organs? How does he function with no sustenance? Sure, sunlight empowers him; but do the writers honestly expect us to believe that he's never landed on a planet without a yellow sun to sustain his energy? What even is the point of him still having a mouth if he doesn't need to eat anything? How the hell does he grow bones without the required calcium? If he doesn't have organs, what is even pumping his blood?
If you read Hunter Prey, it was showed that DD was genetically breed to evolve. Every time he dies, the scientist would grab the body and patch him up and start the process all over again. He’s adaptability came from that.
DD before becoming DD used to bleed, needed to breath and eat, it was his father that removed those aspects from him by killing him over and over on Krypton.
Also, DD stores sunlight even better than Kal, remember that DOS takes place at least a few thousands years after DD died fighting the Radiant. DD body was then cover in that prison, put on space ship, where said space ship landed on Earth and spent thousands of years under ground with no sunlight whatsoever.
He’s energy was so great, that when he escaped, and with just one hand was punching the ship so hard, that tremors were felt. Remember, DD was dead for thousands of years and lack any sunlight.