Creation

Grain Belt debuted in Marvel Zombies Supreme #2 by Frank Marraffino and Fernando Blanco

Major Story Arcs

Marvel Zombie Supreme

To get the superheroes a semblance of checks and balances, Tony Stark sponsored the Super-Hero Registration Act, which would require all superheroes to work for the government. Part of the act was the establishment of the 50-State Initiative, where each of the U.S. states would receive their own version of the Avengers, with heroes trained by former and active Avengers. Grain Belt was assigned to The Harvesters, the official team of Kansas.

Project Pegasus was experimenting on a zombie virus strain on the Squadron Supreme, a team of heroes from an alternate universe. That team's powerhouse, Hyperion (a pastiche of DC's Superman), managed to escape and crash landed in Kansas, activating The Harvesters.

They were considerably outmatched. Grain Belt was blown away by super breath

Powers & Abilities

Grain Body: Grain Belt's body is made up of grain, similar to how Sandman was made out of sand. He presumably could shapeshift and manipulate his size by adding and subtracting grain.