The droids, Jann, Mon Julpa, and Sollag, along with freighter pilot Jessica Meade, travel to Tammuz-an to thwart Ko Zatec-Cha, an evil vizier with ambitions to seize the throne of the planet Tammuz-an. To achieve his sinister plans, Zatec-Cha hires bounty hunter IG-88 to capture Mon Julpa and his royal scepter, but the heroes manage to recover it, and Mon Julpa is made king of Tammuz-an.
