It was during Yeldarb's tenure aboard the Umboo Lightstation that Mungo Baobab's Caravel was intercepted and captured by Koong, mistaking the explorer for Terrinald Screed. With Baobab's help, Yeldarb was able to escape the governor's grip and, in grateful return, point the treasure-hunter and his droid companions, R2-D2 and C-3PO, in the direction of the Roon system.
Following Koong's death, Yeldarb returned to the Umboo Lightstation and resumed his duties.