Jack was Jackal's second of five successes at cloning Peter Parker.
He takes Spider-Man and Scarlet Spider through a snowy forest to the Jackal's mountain laboratory, that's being guarded by a monster called the Guardian. After facing him, he leads the spiders through the passage that was previously guarded and they enter a huge lab, where the Jackal, who was believed dead, steps out of a regeneration chamber.
Jack gave Scarlet Spider a disk that is supposed to contain proof that he is the real Peter Parker. When the Jackal sees his assistant do this, he snaps his fingers, causing Jack to deteriorate.