Venom (Eddie Brock)
After The Symbiote was rejected by Spider-Man, it found Eddie Brock and together they formed the original Venom. From his first appearance in 1988 until he auctioned off The Symbiote and was administered to a hospital in in 2005, Brock's Venom appeared in multiple self titled limited series as well as countless other marvel super hero titles. For a detailed description of Eddie Brock's histroy, visit Marvel.com (where I borrowed the photo for this post).