GAT-X131 Calamity Gundam is one of the three Earth Alliance mobile suits stolen by the Biological CPU pilots in Mobile Suit Gundam SEED. Piloted by Orga Sabnak, the Calamity specializes in overwhelming firepower with its massive arsenal of beam and projectile weapons.

The Calamity features a distinctive bulky design with green and gray color scheme, equipped with the Scylla 580mm energy cannon, Todesschrecken plasma-sabot bazooka, Schlag hammer, beam saber, and shield. Its Trans-Phase armor provides exceptional defensive capabilities, making it a formidable opponent in both ranged and close combat.

Gunpla kits of the Calamity Gundam include HG and MG releases that capture its heavy weapons loadout and imposing presence. These kits appeal to builders who appreciate heavily armed mobile suits and the darker aspects of Gundam SEED's storyline.