Dollen was the leader of the Pangarans.
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He was in charge of the negotiations with SG-1 in order to obtain new Stargate addresses of Goa'uld-occupied worlds to find a new Goa'uld queen. He offered the drug Tretonin in exchange. He was able to get off of the Tretonin with the help of the Tok'ra Egeria. (SG1: "Cure")