Ta'seem was a Tok'ra scientist who traveled to the Earth vessel Odyssey to extract the Goa'uld symbiote, Ba'al, from Adria and replace it with a Tok'ra symbiote, Zanuf. The extraction procedure failed, as Ba'al released its fatal symbiote toxin before the removal process could be completed. Following Ba'al's removal, Adria regained consciousness and used the minutes she had left to live to kill Ta'seem and the guards and ascend. Ta'seem had once known Vala Mal Doran as Qetesh. (SG1: "Dominion")