The original Sentinel prototype and the creator of all other Sentinel robots, Master Mold was created to protect humanity from mutants. But when it decided that humans and mutants both posed a threat to the world, Master Mold went rogue and created its own vision of the world. Determined to control all humans and destroy all mutants, Master Mold began to create the mutant-hunting Sentinels which have plagued mutantkind and the X-Men ever since. Now, Master Mold is back--and this time its firing powerful Sentinel projectiles, and it won't stop until every mutant and human is taken care of the way it sees fit!