The Toy Store Alien originated from a crashed spacecraft hidden in the mall's storage areas, with its bio-organic form merging with the toy store's inventory during the initial outbreak. It was discovered by survivors looting for supplies, and its presence explains strange mutations in the infected, as its extraterrestrial DNA interacts with the zombie virus. This entity now lurks among the aisles, using animated toys as scouts and traps.

The Toy Store Alien possesses a chitinous, multi-limbed exoskeleton that shifts colors to blend with its surroundings, making it nearly invisible in the cluttered toy store. It emits a low-frequency hum that disorients survivors and can manipulate electronic toys to create distractions or attacks. Its acidic secretions dissolve mall infrastructure, and it moves with uncanny agility, scaling shelves and hiding in play structures.

The Toy Store Alien serves as a hidden orchestrator of the mall's chaos, using its abilities to amplify the zombie hordes' ferocity and create new infection vectors. It targets survivors who venture into the toy store for resources, turning the area into a deadly hunting ground.