Mighty creator of the Transformers race, both Autobots and Decepticons owe him their loyalty as his children. He is as old as the universe itself and matched in power only by his twin brother, the evil Unicron. Primus is the Lord of Light - a pure, natural force of order, strength, and peace, committed eternally to the struggle against chaos, destruction, and the ever-advancing darkness of Unicron.
There were two different versions of Primus, one with a Unicron head as an accessory and one without. Both versions had the same price and were released in equal numbers.