Thot Gor was the representative of the Breen Confederacy to the Dominion in 2375. As the Dominion War grew to a stalemate in mid-2375, Gor was secretly approached by the Female Changeling for an alliance between the two powers. Seeing an opportunity for conquest, Gor traveled to the Cardassian Union to sign the treaty of alliance. En route, his ship captured Lieutenant Commander Worf and Lieutenant Ezri Dax, who had been stranded on a planet in the Goralis system. Following the retaking of Chin'toka, Gor was succeeded by Thot Pran as commander of the Breen forces.