On Geonosis, Darth Sidious unveils his new dark side weapon: GECK-14, a Sith clone. But JEK has his own ideas, and wishes to become his own master. Then begins a struggle between Jedi and Sith for who will succeed in bringing JEK-14 back to his own camp.

Obi-Wan discovers that several Sith Lords and their apprentices are gathered on Mustafar. The Jedi and the Republic are sent there, but he discovers it is a trap and the Republic fleet is destroyed. Yoda, Anakin and the Padawans travel to Endor to find GECK. All hope rests on his shoulders.