Kaine is a fictional character, a Marvel Comics villain or antihero and enemy of Spider-Man. He first appeared in Web of Spider-Man #119, and is the Jackal's first failed attempt at cloning Peter Parker. The character was created by Terry Kavanagh and Steven Butler.
Kaine is the Jackal's first temporary success at cloning Peter Parker but, due to the flawed cloning process is left deformed and mentally unstable.
The Jackal discards Kaine because the clone starts showing early signs of the degeneration process, and Kaine experiences a strong feeling of rejection similar to that between a father and son. Kaine realizes the partial degeneration also caused a slight amplification of the powers he "inherited" from Peter. Not only has his strength, speed, and agility been copied from the original Peter's, but he gains a "precognitive sense" that shows him flashes of the future (an amplified version of Peter's spider-sense). He also possesses a "Mark of Kaine," a burning touch that he uses to leave eaten away hand prints on his victims' faces. Though never explicitly stated within the story, in a later interview former Spider-Man editor/writer Glenn Greenberg revealed that the Mark of Kaine was meant to be another analog of one of Spider-Man's powers, namely the ability to cling to walls.
The Jackal goes on to create a new, better clone, the man who would become Ben Reilly. When the Jackal uses Reilly against Peter, the ensuing battle leaves Reilly and the Jackal for dead. They both manage to survive; the Jackal places himself into suspended animation in a cloning pod to awaken later; and Reilly leaves New York.
Read more about Kaine at Wikipedia ...
Official Site: Marvel
Links: Wiki Entry Spiderfan.org Samruby.com