- Bypassing Starfleet's orders, Lorca uses the USS Discovery crew's ultimate asset, the ship itself, in an effort to end the war with the Klingons once and for all.
- Lorca is ordered to flee before the Klingons arrive but disobeys in order to protect the lifeforms on Pahvo and improve the Federation's chances of detecting the cloaked ships. Admiral Terral says that it is not worth to lose the Discovery over the Phavan transmitter and that Federation scientists can figure out a way to break through the Klingon cloaks, using different methods. Lorca argues that by sending the signal, the Pahvans have declared themselves to be the enemy of the Federation and hence will be annihilated by the Klingons. Lorca refuses to run away from this fight.
Burnham and Saru speculate that the Klingon cloaking device bends all EM radiation, making the ship itself undetectable to Federation sensors. But the background EM radiation contains tiny phase shifts, that are symptomatic to the presence of a cloaking device and its gravitational field. Saru says that if they can determine the exact relationship between the shift and the gravitational field, an algorithm could be developed to expose any Klingon ship hidden by the cloaking device.
The Klingons cannot fire weapons without Decloaking. So, the plan is to beam the boarding party over after the Klingon ship Decloaks and before its shields go up. Meanwhile Lorca had sent Stamets to Culber for a full check-up. Culber finds evidence of modifications to Stamets brain and wants a thorough investigation. But Lorca orders Culber to only send his report to Lorca. Lorca informs Stamets about his plan to make 133 micro jumps using the spore drive to create a 3D map of the Klingon ship's readings when it is cloaked. Lorca knows that he is asking Stamets to make a sacrifice.
Lorca reveals to Stamets that he has been collecting all the data from the Spore drive jumps. They reveal pockets of negative mass that could be connections to possible alternate Universes, and even coordinates to how to reach them. Stamets agrees to the sacrifice as the exploration of the Universe would continue once the Kingons are defeated.
When the Klingons arrive, Tyler and Burnham transport to the Klingon ship and plant sensors that will help create an algorithm for detecting cloaked ships. Burnham detects a human life form on the Klingon ship and goes for a rescue. They find an alive Cornwell hidden with L'Rell, but encountering the latter sends Tyler into shock due to memories he has of her torturing and forcing herself upon him. Tyler goes into PTSD shock, which Burnham is able to revive Cornwell.
Lorca has Stamets make 133 micro-jumps with the spore drive in order to provide a three-dimensional reading of the sensors, while Burnham distracts Kol by challenging him to a fight. Kol wanted to retreat when he detected a possible sabotage of the ship, but Burnham distracts him long enough for Discovery to collect the data needed. Burnham reveals to Kol that she killed T'Kuvma.
The jumps are completed, though not without trauma to Stamets. When the algorithm is calculated, Burnham, Tyler, Cornwell, and L'Rell-who wishes to defect-are transported back to the Discovery and the Klingon ship is destroyed, even though it is cloaked. The algorithm has worked and now Lorca is preparing to transmit the algorithm to Starfleet, so all federation ships can be equipped with it. Lorca is ordered to return to Star base 46 since several Klingon ships are in pursuit to seek revenge. Burnham realizes that Ash Tyler was L'Rell's prisoner. Tyler says that L'Rell tortured him for 227 days, and even sexually abused him. Tyler confronts L'Rell and wants to know why she sexually abused him and she promises to reveal soon.
Stamets volunteers to make one more jump to safety but tells Lorca it will be his last. However, Lorca secretly changes the coordinates, and they jump to an unknown destination surrounded by star ship debris.
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