Venom
Venom is an alien symbiote and typically an enemy of Spider Man.
He originated when spidey's old symbiote found an ex-reporter named Edward Brock. The symbiote bonded with him, making him into a villian named Venom. He combatted Spiderman and Toxin multiple times. After Spiderman and Toxin made a team, Venom surrendered and left the planet.