Venom (Marvel)

 Venom is a symbiote, and one of the most well known foes of Spider-Man.

Origin
While on Battleworld, Spider-Man had damaged his costume and was looking for a new one. Spider-Man accidentally stumbled across the symbiote, and it bonded to him, to make his black suit. T Spider-Man's surprise, the costume could mimic street clothes and provided a seemingly inexhaustible and stronger supply of webbing. Once back on Earth, Spider-Man learned the costume was a sentient alien symbiote that wished to fuse permanently with him and often controlled his body while he slept. With the aid of Mr. Fantastic and the Human Torch, Spider-Man discovered the symbiote was vulnerable to sound and flame, and he used sonic waves to remove it and flames to scare it into a containment module. The symbiote escaped and found its way to Peter Parker's closet and disguised itself as a spare red and blue costume. It attempted to forcibly bond itself to Spider-Man. Later the Vulturions attacked and Spider-Man forced him to take them all to a church tower. The bells rang to sound the hour, the symbiote felt the pain. The clanging of the church bells and Spider-Man's rejection of the symbiote weakened the alien. The symbiote, using its remaining strength, it slithered away from Spider-Man and the bells. The rejection of the symbiote left it extremely bitter toward Spider-Man, a trait it would share with its future hosts. After finally coming off of Spider-Man, Eddie Brock, who had gone to the same church to ask for Peter Parker to die, as the symbiote fell down to the ground, it began to bond with Brock, creating Venom.