Sandman (real name Flint Marko) is a formerly mentally unstable criminal who was caught in an atomic explosion, that enabled him to become the "Sandman". He later became an ally of both Spider-Man and S.H.I.E.L.D..
Flint Marko is a tall Caucasian male with a muscular build, he has short brown brown hair and brown eyes. Flint wears a shirt with dark and light green stripes, dark brown belt, shoes and light brown pants.
His other persona Sandy, is a young Caucasian boy, with combed brown hair, a rounder face and brown eyes. He wears the same light and dark green striped shirt as Flint, short light brown pants, dark brown belt and shoes.
Flint Marko was a criminal, when one day he escaped from prison, but unfortunately was caught up in an atomic explosion. The explosion had mutated Flint into sand particles and was enable to control them. Later, Nick Fury captured him and left him on an isolated island within the Bermuda Triangle. He became lonely on the island that he created a playmate for himself using the island's sand, which he called "Sandy".
Spider-Man and his team encounter Sandman on an island that Nova finds to use as a vacation spot. Sandman first appears to them in the form of a young boy named Sandy who wants to play with Spider-Man's team. Spider-Man's team finds Sandy's "brother" Flint who claims that Sandy is always playing in the ruins (which suddenly forms). When Spider-Man's team goes on a tactical retreat, Sandy turns into sand and moves the S.H.I.E.L.D. Quinjet to the top of the ruins daring them to come get it. Spider-Man and his team end up attacked by Sandy and Flint who then forms a sand labyrinth for them to maneuver around. Power Man finds hieroglyphics where it said that Sandman escaped from prison and was caught in an explosion that gave him his powers. The hieroglyphics state that Nick Fury dropped Sandman on the island. Flint and Sandy combine into one Sandman which Spider-Man and his team fights. Spider-Man fights Sandman while the others try to get to the Quinjet. Nova lifts the Quinjet as Spider-Man's team flies away until they are intercepted by Nick Fury's agents. Nick Fury finds out that Spider-Man's team went to the island that Sandman was on and wants them at the Helicarrier for a full scrub-down. Nick Fury mentioned that they dropped Sandman on an island because no prison could successfully contain him. It is then shown that Sandman had stowed away in Spider-Man's outfit as he forms in the Quinjet and freezes the controls. Upon landing in the frozen Hudson River, Spider-Man and his team had to stop Sandman before he reaches land. Iron Fist cracks the ice and Spider-Man tells Nova to heat Sandman's body enough to turn him to glass. Sandman was then placed in a special containment unit (which resembles an hourglass that is always moving) that would keep him from reassembling. Spider-Man notes that Sandman's isolation on the island likely affected his sanity, which Fury admits is true; he should not have left Sandman alone, referring it to the equivalent of "sweeping it under the rug".
Later, Awesome Android accidentally frees Sandman who ends up stopping Awesome Android and putting out the fire Awesome Android caused. Sandman stated to Spider-Man that he just wanted to help. Nick Fury mentioned that S.H.I.E.L.D. has been working to rehabilitate Sandman and hoping to make him a hero. Spider-Man has Nick Fury let him train him to be a hero. Sandman is outfitted into a special containment suit (which resembles the suit that Wizard made him in the comics) that limits his power by Walter and Amanda Cage. While S.H.I.E.L.D. Agents observe Spider-Man's program, Spider-Man takes Sandman to battle Swarm where Sandman's containment suit is targeted by Swarm. Spider-Man is forced to get the containment suit off of Sandman who then pummels Swarm into submission. Sandman is brought into control and apologizes for his actions. With advise from Iron Fist, Spider-Man trains Sandman (whose containment suit has been replaced) into being a man first and a Sandman second. When Batroc the Leaper is in the middle of a robbery, Sandman springs into action where he attacks Batroc the Leaper. When Batroc the Leaper throws a garbage at Sandman, he ends up attack Batroc the Leaper as J. Jonah Jameson makes a bad comment towards Sandman. Sandman loses control of his emotions and breaks out of his suit where he attacks Spider-Man with a sandstorm attack. Nick Fury sends the rest of Spider-Man's team to help Spider-Man stop Sandman. Spider-Man denies Nova's plan to turn Sandman into glass again as Spider-Man has a different plan. Spider-Man then tries to reason with Sandman until Nova arrives and Spider-Man throws Awesome Android into Sandman's mouth where he absorbs Sandman. When S.H.I.E.L.D. Agents arrive with a new containment suit, Sandman is shot into the containment suit and taken into S.H.I.E.L.D. custody.
In the episode "Contest of Champions" Pt. 2, the Grandmaster uses Sandman against Spider-Man in a game of "Capture the Flag." Spider-Man tries to reason with Sandman that he is not a villain to which Sandman stated that S.H.I.E.L.D. has always keeping him locked up. The Collector places Captain America, Red Hulk, and Iron Fist into the game. With an idea from Spider-Man, Red Hulk was able to heat himself up enough to turn Sandman into glass removing him from the game.
Spider-Man and Iron Spider's pursuit of Vulture takes them to a nearby island where it was discovered that Doctor Octopus has captured Sandman and cloned him from his sand samples in order to find the "Ultimate Sandman" that would join his Sinister Six. When Iron Spider stumbles onto Doctor Octopus' lab, he ends up imprisoned by Doctor Octopus as one of Sandman's clones wears the Iron Spider armor. As Amadeus Cho and Sandman work to get free, Spider-Man fights Doctor Octopus, his Octobots, and the Sandman Clones. Upon Iron Spider uses an electronical disruption to deactivate Doctor Octopus' remote, the Sandman Clones are rendered inert as Sandman reabsorbs them. After Doctor Octopus gets away, Spider-Man and Iron Spider allow Sandman to assume his sand form in an area near the Triskelion telling him that he'll be given a chance to join the S.H.I.E.L.D. Academy whenever he's ready.
Spider-Man awakens Sandman to fight Hydro-Man while he went after Doctor Octopus. Both Sandman and Hydro-Man were easily matched. After the destruction of Octopus Island, Sandman caught the escape pod that Spider-Man and Aunt May were in and then proceeded to defeat Hydro-Man.
Sandman was seen at the Triskelion taking part in the beach activities with the S.H.I.E.L.D. Academy cadets.
Powers and Abilities
- Psammokinetic Physiology: After the atomic explosion, Flint's body was mutated so that he was able to control sand particles. With it he is able to manipulate sand with his mind. Each and every cell in his body was replaced with a molecule of sand
- Immortal: Due to his body being made of sand particles instead of biological cells & tissues, he doesn't age, no does he need to eat, rest, or even breathe.
- Transformation: Flint Marko is able to turn into a being of sand, with it he is invulnerable to physical attacks and can move at incredible speed. Sandman can transform into various objects, he can also use it to enlarge himself and encase his fists with sand.
- Self-Size Manipulation: He can grow into an enormous size, further enhancing his psammokinetic attacks, superhuman strength & durability.
- Density Shifting: Sandman is able to shift the density of his elemental sand constructs to be able to hurt his foes.
- Superhuman Strength: Being able to harden his sand into actual rock, his strength is far stronger than that of an average human.
- Terrakinesis: Sandman can control every particle of sand in his vicinity. 
- Self-Reformation: After Sandman's grains are scattered he is able to mentally reform back to his original form.
- Invulnerability: By mimicking sand, Sandman is invulnerable to physical attacks.
- Intense Heat: Sandman has a weakness that he can be turned into glass when the silica in his sand gets heated around 2000 °C.
- Vibrations: Sandman also can't reform back to his original form if he gets interrupted by vibrations.
- Water: He is also vulnerable to water since he first never left the island. Hydro-Man was able to physiclal harm him & this caused his self-reformation abilities to slow down as well, because the damaged area turned into mud.
- Soul Molecules: By physically traumatizing the part of sand which houses his soul & mind, he can attain significant damage.
c - cameo
Background in other media
- This is Sandman's fourth animated appearance. Previous versions include "Spider-Man (1967)", "Spider-Man & His Amazing Friends" and "The Spectacular Spider-Man".
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