- While in unfamiliar territory, the U.S.S. Discovery crew is forced to get creative in their next efforts to survive opposing and unprecedented forces and return home.
- Discovery's sensors are re-calibrating. The Klingon wreckage is registered hull density outside of the normal parameters. The discovery is attacked by a Vulcan ship but rescued by ISS Cooper. Lorca finds it odd, since the USS Cooper was undergoing a refit. Cooper identifies the Vulcans as rebels and proceeds to destroy them. Saru says that Quantum signature of the Vulcan ship and the Cooper is different to the Discovery, which is impossible since all known matter in the Universe has the same Quantum signature.
Discovery's crew determines that they have arrived in a parallel Mirror Universe, with Stamets now unconscious and unable to power the spore drive. Stamets's eyes have gone white and he talks about infinite possibilities, and about a palace. Meanwhile the Discovery cannot transmit the algorithm to Starfleet in their own Universe, and without it, the war is lost. Tyler confronts L'Rell, and she attempts to use a verbal cue to trigger something within him, though he fights this off.
They find a data core in the wreckage of a Klingon ship. Tyler is sent to retrieve the data core and Lorca can see that Burnham has feelings for Tyler. They learn that this universe is ruled by the human Terran Empire, who are fighting a resistance that includes species such as Klingons and Vulcans. Terrans are an oppressive, racist and xenophobic culture. They are led by a faceless emperor. The rebels are made of all non-human species fighting for freedom. Saru determines that ISS Discovery was at the same location where USS Discovery appeared in the parallel Universe. So, he theorizes that the 2 ships switched places in their respective Universes.
The ISS Discovery is captained by Sylvia Tilly's counterpart, so Tilly and the crew pretend to be their Mirror selves. Burnham makes the entire crew to change into new uniforms and assume their new personas, consistent with their mirrors in the parallel Universe. Here, Burnham is the former captain of the ISS Shenzhou, presumed dead after an attack by the fugitive Lorca. Lorca attempted a coup against the Emperor, and Burnham was sent to stop Lorca. Burnham was killed while piloting a shuttle and the Emperor laid waste to Lorca's ship, who presumably escaped.
The data core also indicates that the USS Defiant also crossed over into the parallel Universe from the future time period of the Original Universe. Lorca and Burnham know that the Defiant didn't use the Spore drive, and thus understanding how the Defiant crossed the boundary could be a key to them getting back to their own Universe.
They deliver Burnham and Lorca to the Shenzhou (which is captained by Connor in the parallel Universe), under the ruse that Burnham had been hunting Lorca since her presumed death and has now captured him. The plan is to get the data on the Defiant from the Shenzhou and return back to the USS Discovery.
Tyler comes to Culber for a complete physical. Stamets comes back from his coma to tell Culber that the "enemy is near" and that he should be careful, before going into coma again. Culber informs Tyler that he appears to have undergone major surgical modifications, which triggers something in Tyler and he kills Culber.
Tyler joins the others on the Shenzhou, where Lorca is tortured while Burnham assumes command. Burnham is escorted by Connor to her ready room. But Connor attacks Burnham in the lift, and Burnham defeats him. Connor's dead body falls to the floor and the lift reaches the bridge. The crew claps for Burnham. Tyler meets Burnham who says that she didn't find the files on the Defiant. Burnham and Tyler have sex.
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