Anti-Venom

Anti-Venom is a character from Spider-Man. He was once Eddie Brock and the monstrous being named Venom. The Symbionte was causing Eddie a terrible pain from being united by the blob for so long. Spider-Man, was able to free him, and get a small sample for Dr. Connors to examine and create antidote, to destroy the Symbiote before it found a new host. With Spider-Man's help, he was able to create anew Symbionte and fused it with Eddie, and He was cured, and empowered into Anti-Venom. He then dedicated his life to destroying the remaining Symobionte spawns that remained unchecked, with Spider-Man, and even defeated Venom's son like spwan, Carnage.

Trivia

 * Anti-Venom will appear in the future taking on a new Venom, and Carnage.