Sil Onda'tek was a male henchman for Jabba the Hutt during the Galactic Civil War.
During 1 ABY, Kaeline Ungasan wished to become a new force in Tatooine's criminal activities. Fortunately for him, he encountered a spacer willing to help him during his stay in Mos Espa. Seeing Jabba Desilijic Tiure as his greatest obstacle, Ungasan wished to obtain a list of security agents working for Jabba. Sil Onda'tek had such a list, so Ungasan tasked the spacer with finding Onda'tek and killing him. Fortunately for him, the spacer succeeded and gave him the datadisc containing the list of agents.
Sil Onda'tek is a Non-Player Character (NPC) in the MMORPG Star Wars Galaxies. Players who perform a series of quests for Ungasan in Mos Espa must hunt down and kill Sil Onda'tek outside the city.
Due to the nature of many older quests in Star Wars Galaxies, the species and appearance of Onda'tek changes each time a player performs this quest. Therefore, it is impossible to verify the canonical species of Onda'tek. However, the quest dialogue given by Ungasan indicates that Sil Onda'tek is a male.