Tanith was a Goa'uld symbiote, who was incubated in the Jaffa priestess Shan'auc. During this time Shan'auc was able to communicate with her symbiote and Tanith tricked her in believing that he was not like the other Goa'uld. Because of this she contacted Teal'c and Stargate Command, who then contacted the Tok'ra because Tanith wanted to join them. The Tok'ra accepted his offer and when Tanith matured he was implanted in a new host named Hebron. However Tanith quickly took over Hebron and showed his real face: he confronted Shan'auc, told her about his betrayal and finally murdered her.