Read more about Agony at: Wikipedia

Official Site: Marvel

Agony is a fictional character and a supervillain from the Spider-Man comic books. She is the host to one of six symbiote spawns of Venom. Her symbiote is predominantly purple.

Leslie Gesneria was a mercenary who worked for a sinister corporation called the "Life Foundation", who was preparing for the M.A.D. nuclear fallout of the Cold War and sought to provide a comfortable underground life for their wealthy clients after the impending nuclear holocaust. The Life Foundation was experimenting with the Venom symbiote in the hopes of developing superhuman peacekeepers to watch over their imagined fallout shelter utopia. Leslie was one of two women who were chosen as hosts for Venom's forcibly-extracted symbiote spawn. She is defeated by Venom and Spider-Man in the storyline Venom: Lethal Protector. Her symbiote is artificially aged to dust and her body is presumed destroyed in a massive explosion that destroys the Life Foundation's main headquarters.

The symbiote was revealed to have survived in the mini-series Venom: Separation Anxiety. Leslie mentions that she had wanted to be a hero, but like the other hosts of Life Foundation symbiotes was having trouble in controlling her symbiote. This lack of control over the alien bonded to her kept resulting in violence. Leslie and the others break Eddie Brock, Venom's secret identity, out of prison and kidnap him in order to make him teach them how to control their symbiotes. Leslie shows remorse and regret for her actions, just before she is murdered by her "sister" Scream, using a sonic knife.

After Leslie is killed, what is left of her symbiote merges with its siblings (except Carnage and Scream) and bonds with a man named Scott Washington to form a new antihero called Hybrid.

Agony has not been a contender in any CBUB matches.