Miles Warren aka Jackal was a professor at Empire State University. There, he met Peter Parker and Gwen Stacy. Warren secretly fell in love with Gwen. After Gwen Stacy's death Warren went into depression and despair, which drove him further into insanity. Warren swore vengeance on Spider-Man, believing it was the superhero who caused her death. Gwen's death
- He cloned Peter Parker and Gwen Stacy
- The well known clones Miles created are Ben Reilly and Kaine Parker.