"Treachery, Faith, and the Great River" is the 156th episode of the television series Star Trek: Deep Space Nine, the sixth episode of the seventh season. It was first aired the week of November 2, 1998. The teleplay was written by David Weddle and Bradley Thompson, based on a story by Philip Kim, and directed by Steve Posey. When it was aired on television in November 1998, the episode received Nielsen ratings of 4.8 points corresponding to over 4.7 million viewers. Set in the 24th century, the series follows the adventures of the crew of the Starfleet-managed Bajoran space station Deep Space Nine. The later seasons of the series follow a war between the United Federation of Planets and an expansionist empire known as the Dominion, ruled by the shape-shifting Changelings, which has already absorbed the nearby planet of Cardassia. In this episode, a clone of Weyoun, one of the Dominion's genetically engineered Vorta administrators, attempts to defect to the Federation; since the Vorta see the Changelings as gods, Weyoun delivers himself into the custody of DS9's security chief Odo, a renegade Changeling who has rejected the Dominion. Guest stars include many of Deep Space Nine'''s recurring cast, including Jeffrey Combs as two clones of Weyoun, Casey Biggs as Cardassian leader Damar, J. G. Hertzler as Klingon General Martok, Aron Eisenberg and Max Grodénchik as Ferengi engineers Nog and Rom, and Salome Jens as a Changeling. Plot Odo is summoned to a secret rendezvous by Weyoun, who says that he has decided that the Dominion's war against the Federation is misguided, and offers to defect. Odo distrusts Weyoun, and is irritated that Weyoun considers him a god, but takes him into custody. Soon their runabout is hailed by another Weyoun, who explains that the Weyoun clone with Odo (Weyoun VI) was activated after the accidental death of the previous Weyoun; his successor, Weyoun VII, was activated when Weyoun VI abandoned his post and was deemed "defective". Weyoun VII orders Weyoun VI to activate his self-termination implant, but he refuses. Damar persuades Weyoun VII to order the runabout destroyed to prevent Weyoun VI from reaching the Federation; Weyoun VII is reluctant to risk the death of Odo, a Changeling, but eventually consents. When one of his Changeling superiors demands an update, Weyoun VII is subservient but vague in his answers, not revealing Odo as their target. Damar notices that the Changeling