The Jackal (Miles Warren) is a supervillain in the Marvel Comics universe, and an enemy of Spider-Man. He first appeared as Miles Warren in Amazing Spider-Man #31, and as the Jackal in Amazing Spider-Man #129.

Prof. Miles Warren was once a professor of biochemistry at Empire State University. At some point, he studied genetics under the tutelage of the High Evolutionary, but was expelled from the Evolutionary's headquarters when he proved to be unstable. He received further training and equipment from Maelstrom. Warren fell in love with one of his students, Gwen Stacy, who was the girlfriend of Peter Parker (Spider-Man). After Gwen was killed by the original Green Goblin, Warren became completely insane, developing the personality of the Jackal. In his first appearance as the Jackal, he attempted to manipulate the Punisher into killing Spider-Man, but when the Punisher learned of the Jackal's deception, he turned against Warren.

The Jackal - with the aid of a Scrier , working for the Green Goblin - subsequently worked to create clones of Peter Parker and Gwen Stacy. However, his first apparently successful attempt, Kaine, quickly began to show signs of degeneration (but managed to escape before Warren could kill him). Warren then refined the process, and although several more failures resulted, he eventually successfully created clones of Gwen, then Peter, who did not suffer from the tell-tale degeneration. The Parker clone and the Jackal were both apparently killed in battle with Spider-Man, but both men survived and went into hiding. A clone of Miles Warren appeared during the time that the original was believed dead, and actually married the Gwen Stacy clone. The Jackal's research was also used to create the several incarnations of the villain Carrion , one of whom was thought to be another clone of the Jackal.

The Peter Parker clone, unaware that the Jackal lived, took the name Ben Reilly, and years later, he returned to New York City, allied himself with Spider-Man, and become the Scarlet Spider. The Jackal returned at this point and convinced both Parker and Reilly that Reilly was the real Peter Parker and that the other man was the clone, and created a number of other Peter Parker clones who came into conflict with Spider-Man, the Scarlet Spider, and Kaine. Ultimately, the Jackal, in the process of attempting to kill and replace millions of people with clones he could control, was killed falling off a tall building while trying to save the Gwen clone, who was saved by Spider-Man.

Shortly after, Parker retired to spend more time with his pregnant wife, Mary Jane Watson-Parker, and Ben Reilly briefly replaced him as Spider-Man, until he died at the hands of the Green Goblin, finally revealing in the process that Parker was and always had been the original Spider-Man.