- As the DMA approaches Earth and Ni'Var, and with evacuations underway, Burnham and the team aboard the U.S.S. Discovery must find a way to communicate and connect with a species far different from their own before time runs out.
- The Federation starts the evacuation of Earth. Vance knows that in the best case, they can save half a million people from Earth and Ni'Var each. The DMA power source is good at storing energy but does not respond well to external force. Tarka starts hitting the power source with Gravimetric beams. Ndoye admits to Rillak and Burnham that she vented the plasma, collaborating with Tarka and Book.
Tarka evades the orbs by constantly changing his course and being unpredictable in his approach to the power source coordinates. Burnham tells Ndoye that Tarka took Book hostage and is now working alone. Tarka begins dismantling the power source's container, causing dangerous plasma bursts.
Discovery asks to be let free of the orb, but the 10-C respond that they are already free, referring to Tarka's escape. T'Rina offers to connect with the 10-C telepathically to communicate faster. T'Rina learns that the minds of the 10-C are connected, and they do not understand that Tarka is acting independently of Discovery. They are confused and terrified as they cannot stop Book's ship.
The crew sacrifices Discovery's spore drive to escape the orb. The Spore drive releases massive amounts of energy which is converted to momentum. Because the Discovery is stationery, this energy is transferred to the orb and disintegrates it. But is also fries the Spore Drive. This means the Discovery will have to warp back home, which will take decades. They are unable to approach Book's ship due to the plasma. Meanwhile, Reno and Book work together to escape the energy containment field and they knock out Tarka. But Tarka has locked them out of the ship's systems. There is no way to reverse the process. Book asks Reno to beam back to the Discovery.
On Earth, Vance carries out the evacuations till the last possible second and then orders all evacuation ships to leave as he stays behind to provide covering fire for as long as he can. The DMA debris starts penetrating the Earth's defense systems and hits the planet.
Rillak suggests that they confer with General Ndoye as she has a brilliant tactical military mind. Ndoye offers to make amends by ramming Book's ship with a shuttle-craft, disrupting the process of extracting the power source. Ndoye is beamed back to safety. Tarka and Book are alive but cannot be beamed back due to the force field around Book's ship. Tarka beams back Book, as his life in this Universe, while his life is with Orso. The ship hits the hyper-field and Tarka dies, but Book doesn't arrive on the Discovery and is presumably dead.
The crew of Discovery meet members of 10-C on a planet inside the hyper-field and explain that Tarka was working alone, and why. The 10-C understand that the humans are not one and that they are many. They also understand the Discovery's request to exit the orb. The 10-C understand how the DMA destroyed planets and caused sadness in the galaxy. And that the same thing is going to happen again to Earth and Ni'Var. Burnham asks the 10-C to stop their device. The 10-C turn off the DMA, sparing Earth and Ni'Var. They sense that Burnham is still sad, and she reveals that she loved Book. The 10-C reveal that they saved Book and reunite him with Burnham.
Discussing his grief and using his empathetic abilities, Book convinces 10-C to stop using the DMA altogether, take down the hyper-field, and start working with others to make amends for the harm caused by the DMA. He says that the DMA leaves behind a toxic mess and needs to be shut down, but the 10-C say that they cannot power the hyper-field without it. Book convinces them to accept the space and live without the hyper-field.
10-C uses a wormhole to send Discovery to Earth, which decides to rejoin the Federation.
Book is punished for his actions by being sent to help others who have been harmed by the DMA. Saru and T'Rina start a relationship accepting their feelings for each other.
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