Transformers Action Figure Add-On Accessory: Vector Sigma Gift Set Complete your Masterpieces Optimus Prime! Vector Sigma frequently acts out the will of Primus, and among its other abilities is the infusing of inanimate Transformer bodies with new life. Activating it requires a special circuit key, and possession of the key brings great power. Vector Sigma comes cast in a translucent, sparkled plastic. Includes gold chromed Key to Vector Sigma.