Amalgam was created after a massive battle in which an Autobot medic and several Decepticons were almost completely destroyed. Barely conscious, the Autobot medic rebuilt himself a new body out of the parts of the destroyed Decepticons around him. The process left him dangerously unhinged, and he remained in his twisted construct form even after returning to base, refusing to be rebuilt into his old form. Instead, he renamed himself Amalgam.