Sandman is a fictional Marvel Comics villain and was created by Stan Lee.
Flint Marko was an escaped convict that fell on a moleculer testing area and became sandman.He clashed with Spider-Man and failed.He later fought hulk in Where fall the shifting sands.He also joins Dock Ock's Sinister Six.
Sandman came in The 1967 Spider-Man cartoon.
Sandman appeared in The Fantasic Four.
Sandman appeared in The 1981 Spiderman cartoon.
Sandman appeared in a few episodes of The Spectacular Spiderman