spoilers:end of spoilers
In a nutshell, the spiderlike alien parasites that infected Jesse Drew's blood were reverse-engineered into two different strains that granted spiderlike powers in one case and lizard-like powers (and appearance) in another case, and then the spider-strain was further reverse-engineered into a symbiotic/parasitic ooze that could bond with someone's biochemistry. And we have Elsa Brock instead of Eddie Brock in this universe. Am I about right?