Flint Marko

A shapeshifter endowed through an accident with the ability to turn himself into sand, starting as a recurring adversary to Spider-Man but redeeming himself over time.

The Sandman (William Baker, a.k.a. Flint Marko) is a character appearing in American comic books published by Marvel Comics. A shapeshifter endowed through an accident with the ability to turn himself into sand, he started out as a recurring adversary to the superhero Spider-Man, but has redeemed himself over time, eventually becoming an antihero. The Sandman has also been an enemy of the Fantastic Four and is a founding member of the supervillain teams the Sinister Six and the Frightful Four. In 2009, the Sandman was ranked as IGN's 72nd Greatest Comic Book Villain of All Time.

Quick Facts

Character name

Sandman

Real name

William Baker

Publisher

Marvel Comics

Debut

The Amazing Spider-Man #4 (September 1963)

Creators

Stan Lee; Steve Ditko

Species

Human mutate

Alliances

Sinister Six
Frightful Four
Avengers
Wild Pack
Enforcers
Outlaws
Intruders

Also known as

Flint Marko
Sylvester Mann
Quarryman

Lore & Background

William Baker was born in Queens, New York. When he was three years old, his father abandoned him and his mother. In preparatory school, a boy named Vic bullied Baker until he learned to fight using an opponent's motions against themselves, a technique he performed as if he 'slipped through their fingers like sand'. In high school, William played on his school's football team, adopting the nickname 'Flint' after his former teacher.

After Vic incurred a large gambling debt, Flint fixed a football game but was kicked off the team; he then hit his ex-coach, resulting in expulsion and the beginning of his life of crime. Eventually he ended up in prison on Ryker's Island where he met his father, Floyd Baker, using the alias Flint Marko. After Floyd was released, Marko escaped to a nuclear testing site on a beach near Savannah, Georgia where he came into contact with sand that had been irradiated by an experimental reactor, transforming his body into sand.

He first clashed with Spider-Man in Peter's high school, where Spider-Man defeated him with a vacuum cleaner. The Sandman later resurfaced as a member of the Sinister Six, led by Doctor Octopus, and also teamed with the Wizard, Paste-Pot Pete, and Medusa to form the Frightful Four to combat the Fantastic Four.

Reader's Guide

Flint Marko's powers come from contact with sand irradiated by an experimental reactor at a nuclear testing site near Savannah, Georgia. He can turn his body into sand, shapeshift, and control his density. His weaknesses include water—as shown when the Human Torch activated a sprinkler system to recapture him—and extreme pressure, such as being trapped in an airtight metal box where Spider-Man defeated him due to having stronger lungs. Marko has been a founding member of the Sinister Six (led by Doctor Octopus) and the Frightful Four (with the Wizard, Paste-Pot Pete, and Medusa).

He has also been an enemy of the Fantastic Four and the Hulk. Over time, he redeemed himself, becoming an ally of Spider-Man, a reserve member of the Avengers, and a member of Silver Sable's Wild Pack. In live-action, he was portrayed by Thomas Haden Church in Spider-Man 3 (2007) and the Marvel Cinematic Universe film Spider-Man: No Way Home (2021), and by Jack Huston in the television series Spider-Noir (2026). An illusionary creature based on the Sandman appeared in the MCU film Spider-Man: Far from Home (2019).

Did You Know?

The Sandman first appeared in The Amazing Spider-Man #4, published in September 1963, created by Stan Lee and Steve Ditko.
He adopted the alias 'Flint Marko' after his coach taunted him about not 'making a mark' on the world.
Writer Roy Thomas commented that he was pleased to see the Sandman's gradual redemption, saying 'He just seemed to me like a character who might have that in him.'