"...in the original Marvel Comics' story, 'Venom' makes an agreement with 'Spider-Man' that they will leave each other alone...
"...on the condition that Venom commits no crimes.
"Venom then moves from New York City to San Francisco, and takes up with a group of Californian 'mole people'.
"Shortly thereafter the father of one of Venom's victims seeks him out with a group of super-powered mercenaries to take revenge.
"Venom then has to take on offspring of the 'Venom Symbiote, including 'Carnage'..."
'Cletus Kasady' aka 'Carnage', debuted in Marvel Comics' "The Amazing Spider-Man" #344 (March 1991) followed by "The Amazing Spider-Man" #360...
...created by writer David Michelinie and illustrators Erik Larsen and Mark Bagley, based on elements of the precursor character 'Venom'.