Mister Negative (Martin Li) is a fictional comic book supervillain appearing in books published by Marvel Comics, usually as an enemy of Spider-Man and the Punisher. Created by Dan Slott and Phil Jimenez, Mister Negative first appeared in a cameo in the history "Swing Shift" of Free Comic Book Day (Spider-Man), an issue set after the events of the "Spider-Man: One More Day" storyline.