Burnham and Tyler have to stay aboard the ISS Shenzhou in the parallel universe until they can either decipher the information on the Defiant, or transmit it to the Discovery without anyone listening. In the meantime on the Discovery, the murder of Dr. Culber has been discovered, but is ascribed to Lt. Stamets. Tilly, however, is sure that Stamets is not himself because of his exposure to the spore network. She convinces Saru to let her proceed with a treatment with spores, rather than relying on conventional medicine. "Captain" Burnham receives orders from the imperial flagship to destroy the rebel base of the "Fire Wolf", the Klingon leader of the alien rebels. She needs a pretext and tells the crew that she would rather beam down with Tyler and steal data that may help eradicate the rebellion once and for all. When she and Tyler materialize on the surface of the planet called Harlak, the two surrender to the rebels. They are taken to a camp and meet the "Fire Wolf", who turns out to be the parallel version of Voq. Burnham tries to convince Voq that she is no longer the ruthless captain he used to know. In order to verify her statement he calls the "Prophet", the parallel version of Sarek. In a mind meld with Burnham, Sarek confirms her peaceful intentions. Tyler, however, becomes increasingly agitated in the presence of Voq, his true identity in the other universe. As memories of his former Klingon life resurface, Voq-Tyler is appalled that his alter ego would ally himself with Vulcans, Andorians and Tellarites. He assaults Voq. Only Sarek's insistence that Burnham's intentions are genuine prevents that she and Tyler are killed by the rebels. Burnham warns the rebels of the impending attack and returns to the Shenzhou with Tyler. Tilly almost succeeds to revert Stamets's brain to the normal state, but then his heart activity drops rapidly, and the medical staff can't save him. Stamets comes back to life though, and in his mind he meets his parallel self. When Burnham confronts Tyler, he admits that he is Voq in human disguise, and that he infiltrated the Discovery. He attempts to kill her, but Saru, the captain's slave in this universe, saves Burnham's life. Tyler is taken to the transporter room for execution. Burnham personally beams him into space, but he then materializes on the Discovery where he is arrested. Saru also takes the storage device with the information on the Defiant that Burnham placed in Tyler's holster. On the Shenzhou, Burnham is informed that another ship begins an orbital bombardment of Harlak. It is the ship of the emperor, who turns out to be Georgiou. Emperor Georgiou is angry that Burnham disobeyed her order to eliminate the outpost immediately.

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