Leader-1 is the Mini-con partner of the Decepticon leader, Megatron. Leader-1 changes into a piece of self-propelled artillery, capable of inflicting great damage on the Autobots. When Leader-1 combines with Megatron, he becomes an extremely powerful cannon, firing mega-powered blasts.
Leader-1 appeared in the following 17 comic books:
Leader-1 appeared in the following 16 cartoon episodes: