Sandman

Sandman's History
William Baker, often known by his criminal alias Flint Marko, was a minor criminal who had escaped from prison. He hid from the authorities on a deserted beach, not knowing that it was actually a nuclear testing ground. Caught in a nuclear blast, Baker somehow survived, although his body fused with the irradiated sand, transforming him into Sandman.

Continuing his criminal career, Sandman frequently came into conflict with Spider-Man. Over the years, he has made many allies, being a founding member of the Sinister Six and the Frightful Four. At some points, Baker has reconsidered his life, becoming a hero and even joining the Avengers at one point. However, one way or another, he has always returned to what he does best: being a super-villain.