A Cerean youngling who became a fugitive on the Trandoshan hunters' moon of Wasskah, O-Mer resigned himself to life on the run -- until Ahsoka Tano rallied him and his fellow Jedi to fight back against the cruel hunters.
Using his Jedi skills for something other than hiding and fleeing, O-Mer proved instrumental in the attack on the Trandoshan base, and won his way back to freedom.
As a fugitive on Wasskah, O-Mer had lost hope and accepted his new life on the run until Ahsoka Tano arrived and inspired him and his fellow Jedi to fight back against the hunters.
During their Jedi training, O-Mer and fellow Jedi younglings, Jinx and Kalifa, were captured and taken to Wasskah to be hunted for sport. The trio banded together and established a hideout inside a hollow tree.
Garnac was the leader of a group of Trandoshans who kidnapped O-Mer and his fellow Jedi and brought them to Wasskah to be hunted for sport.
When O-Mer and his fellow Jedi fugitives mounted an attack on a Trandoshan ship, they inadvertently freed the giant Wookiee, Chewbacca. Scrounging parts from a wrecked Trandoshan slave ship, Chewbacca assembled a communicator and sent out a distress signal.
While stranded on Wasskah with O-Mer and the other Jedi fugitives, Chewbacca sent a distress signal to his home world. Help arrived in the towering, shaggy form of Wookiee warriors led by General Tarfful.