Flint Marko, also known as Sandman, was one of the many villains that Peter Parker came to encounter during his career as the masked vigillante Spider-Man. At one point, Sandman tried to rob F.E.A.S.T but was stopped by May Parker. Sometime later, Spider-Man captured Sandman in a vial of sand.^[1]

• Peter jokingly states that he doesn't know if he would unleash Sandman once more if he opens the vial.^[1]