In a distant future of 3099 on the planet of the symbiotes in universe p-203965-z 1000 years after the earthlings tried to eradicate them with a nanite nuke life finally found a way from the brink of death to thrive.
What symbiotes survived the eradication mutated over those 1000 years and managed to fuse with the remaining nanites becoming a living tech ooze now known as symbi-nites with a new abbility to possess not just living flesh entities but mech/robot entities also making them imune to their previous weaknesses.
What luck for them, as a portal soon opened above their planet sending an entity of unknown origin hurddling through their atmosphere and crashing to the ground, uttering the words "cur...se...y.you....pri..." before colapsing on the ground and going offline.
The symbi-nites were intrigued by the entitiy never have they ever seen a creature or entity like this even in their before state it looked mechanical, but they could sense life in its metal, they studied it for hours until the entity began to regain consisness and come back online so without hesitation the symbi-nite ooze attached it's self to the entity, and started to fuse with it, the entity got up it felt their presence he looked at his hand, he was puzzled as it looked like it was covered in oil, but he heard a voicecoming from the ooze in his mind "you will become, one of us" the entity was shocked muttered some puzzled words "huh what the...." as he shook his hand to try and remove ooze with out any luck, the symbi-nites slowly engulfed his entire body he fell to his knees placing his hands on the ground he muttered "how dare you, i am Nemisis Pri......." before he could even finish the sentence his entire body was completly engulfed in the symbi-nite ooze, transforming him as he stood up still barely grasping to his senses.. "I....I.....AM....." his eyes changed from crimson red to white.... 
"W..WE ARE VENOMUS PRIME"