Dr. Mindbender (Rex Lewis) creates his ultimate wepon; Serpentor, a huge snake, while he also overthrtows the Commander and takes control for himself. The Baroness defects to the G.I. Joes after the death of Destro to fight Cobra. Jinx returns to Snake Eyes' side. Zartan inflitrates Congress as the U.S President and outlaws the G.I. Joes. The final struggle has begun.