- Lorca plans to move forward with a coup against the Emperor, propelling Burnham to make a quick decision to save not only herself, but the U.S.S. Discovery.
- Mirror Lorca frees his old crew, who have been tortured since his disappearance. Mirror Lorca reveals that it was Mirror Stamets who betrayed his ship, the Buran, to the emperor. When the Charon arrived, Mirror Lorca tried to escape into an ionic storm and ended up into the Original Universe due to a transporter malfunction. Mirror Stamets was developing a bio-weapon for the emperor. With the help of Mirror Stamets, who releases the bio-weapon into the Charon, they are able to kill those loyal to Georgiou and usurp her throne.
Georgiou goes into hiding, while Burnham also evades capture and contacts the Discovery. She warns the Discovery that they are now flying into a conflict. Meanwhile on-board the Discovery, Stamets is unable to revive his spores. Although, Stamets discovers that the massive power source underneath the Charon is powered by the Mycelium. The Discovery travels along the network with the spores, but the power source sucks the energy out of the network. This is what the mirror Stamets was working on. This process is poisoning the network and the infection is spreading rapidly. This power runs the entire city sized ship, and powers weapons that can destroy entire planets. If not stopped, the Mycelial network will collapse in the entire multiverse and life will cease to exist.
Burham informs Saru that Lorca they know is a Terran and from the parallel Universe. Stamets says that it was mirror Lorca who changed the coordinates of their last jump. He got all the data he needed from the 133 jumps around the Klingon ship to fill in the gaps for the access points to parallel Universes. Stamets informs Burham how mirror Lorca and mirror Stamets are destroying the Mycelial network. Burnham and Saru agree to a plan in which Burnham lowers the containment field around a large energy source in the ISS Charon that originated from the Mycelial network. The Discovery will then arrive to destroy the energy source, causing an explosion.
On discovery, Stamets says that their torpedoes are not powerful enough to break the energy orb and suggests loading all of their Mycelial spores into the torpedoes to provide enough potential energy to blow the orb apart. But this will use their entire supply of spores and they won't be able to go back to their own Universe. Plus, the blast will release an amount of energy that the Discover's shields will not be able to withstand. They will be incinerated. At this point Saru takes command of his crew and states that his species can sense danger and death, and he doesn't sense anything at this point. He is confident they will survive.
Tilly speculates that the ship can ride into the Mycelial network on back of the explosion and through which Stamets could navigate them back to their own universe. Stamets will integrate the Mycelial spore drive with the warp core to create another layer of bubble, that will protect the Discovery from the blast.
Mirrow Lorca kills mirror Stamets. Burham finds Georgiou and promises that she will never betray her again, in this Universe or any other. Georgiou agrees to help Burnham and they attack Lorca's group right in the throne room. That is the only room from where Burnham can disable the force field around the energy orb. Rejected and defeated by Burnham, mirror Lorca is then killed by Georgiou who offers to sacrifice herself to allow Burnham's escape.
The latter instead decides to take Georgiou with her as they are beamed to the Discovery and the Charon is destroyed. The plan works as speculated and the Discovery is able to ride the energy wave back. Stamets quickly loses track of the pathway to follow, but then finds a "clearing in the forest" based on his mumbling back when he was comatose. He follows the trail home.
Back in their original universe, the Discovery crew learn that they have arrived nine months after they left, and, in the meantime, the Klingons have nearly won the war.
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