....the new origin for the symbiotes is pretty insane.

Apparently there's this primordial proto-god named Knurr who existed before the Big Bang and was basically the God of the Void. Then when the Big Bang happened and all the various cosmic beings in the Marvel universe came into existence and just had to start making shit ruining his perfectly good nothing, Knurr created the All-Black sword (the same sword that would be used by Gorr the God-Butcher in the Thor: God of Thunder series) to start killing gods. Somehow or other during one of his many deaths, he found out that he could use his gooey void stuff to bond living creatures to him, and so he decided that if he couldn't be the god of the void anymore, he'd just hijack everyone else's creations to make himself the center of all life in the universe.

Eventually he made his way to Earth, piloting essentially a giant symbiote-dragon, but he wound up on the wrong side of Thor and got his ass kicked. While he was out of commission, his creations started to get a mind of their own, imprinted on by their hosts, and imprisoned him. Klyntar, the symbiote "home world," isn't a planet at all, but just a giant mass of symbiotes trying to keep their god imprisoned. The word 'Klyntar' isn't the name of their planet or their species; it means "cage."

Meanwhile, that symbiote-dragon thing (which, incidentally, is the same dragon from the Beowulf myth apparently) is still on Earth, and SHIELD was using it for years to create symbiote soldiers long before Venom ever showed up.

So.....yeah. Wonder if any of that's gonna come up in the movie.

Yay. I love when writers force into the narrative the whole "oh, that cool thing we only recently came up with? Yeah, these characters were doing that decades beforehand despite past stories contradicting this." Doesn't end up horribly done ever.