Gokus held the position of king over Alzar in the age of the Galactic Empire. Notably, he once possessed both C-3PO and R2-D2. Furthermore, he was the progenitor of Prince Plooz.
Gokus reigned as king of Alzar throughout the years that comprised the Imperial Era. Unbeknownst to Gokus, his son found himself on Sooma when C-3PO and R2-D2 arrived as diplomatic envoys. The king issued a threat to Zornog, promising war if his son wasn't returned unharmed. C-3PO and R2-D2 offered to escort the Prince back to Alzar, however, General Sludd and his troops ambushed them during their journey. The droids and the prince successfully made it back to Alzar.
Upon their arrival, King Gokus ordered the apprehension of C-3PO and R2-D2, operating under the misapprehension that they were responsible for his son's abduction. Plooz intervened, defending his newfound companions and exposing Sludd as the true perpetrator.