The 2nd Mass leaves Chinatown en route to what they hope will be the final Espheni battle. Along the way, they encounter a deranged and desperate gunman who takes Weaver hostage. Meanwhile, Tom sets off to rescue Hal from Pope and his dangerous group of survivors.
Rejected and alone, Karen sets out to George’s house in search of Niska. Meanwhile, Pete is determined to find out who Karen really is, but his enquiries reveal a truth stranger than he could ever have imagined. The hunted synths gather at the Hawkins, grateful to Laura and family for providing refuge. As humans and synths live alongside each other in peace, could this be the harmonious future that Leo and co have longed for? But as Hobb gets closer, it may be too late for them to find out.
When Harvey’s bitter rival Travis Tanner turns up on the other side of a case, claiming to be a changed man, Harvey and Mike must decide whether to believe him – or bury him. As Harvey’s sessions with Dr. Agard continue, she links his personal stake in the Tanner fight to issues from his past. Meanwhile, Jessica tasks Louis to make things right with Harvey, and with Rachel and Donna’s help he devises a plan – one which could make an enemy of the formidable Jack Soloff.
A mission to procure vehicles and fuel goes awry. Cochise shares troubling news with Anne that will test both her medical and leadership skills. Anthony’s mental stability and his loyalties are brought into question. Meanwhile, a desperate Pope takes things into his own hands.
The fractured Hawkins family reaches its lowest ebb, with dad Joe in exile, and Mattie, Toby and Sophie tired of their parents‘ lies. As the situation reaches breaking point, Laura decides it is time to tell the truth, and her confessions has incredible consequences for household synth Anita. Meanwhile, Karen finally discovers `killer synth‘ Niska’s whereabouts, and a joyful reunion for the runaways is cut tragically short when a brutal betrayal forces one of their number to make the ultimate sacrifice.
Harvey steps outside his usual area of expertise, in order to take a case from a client who has a special tie to the firm. Mike and Zane work their class-action case together, but Mike learns they have different ideas about what constitutes a win – for themselves, and for their clients. And Donna counsels Louis on the best way to settle a feud.
The 2nd Mass discovers the source for the seemingly endless supply of enemy forces. With the Volm’s help, Tom’s leadership begins to spread to remaining human militias around the world. Hal disobeys his father to help Maggie on a personal mission. Meanwhile, Tom has to make an agonizing choice that ultimately risks one of their own, leaving lasting repercussions for them all.
News of the `Killer Synth‘ finds its way into the media, causing widespread panic, and placing Karen under even more pressure to track down the alluring fugitive Niska. However, it seems there may be an ulterior motive to her hunt for the murderous synth. Meanwhile, the Hawkins debate whether to keep Anita in light of their recent discovery that she is not quite as `new‘ as she seemed, and while Joe worries his domestic synth might inadvertently reveal his secret, Mattie’s decision to place her trust in Leo could put an end to the family’s arguments.
Harvey brings some star power to his ongoing conflict with Jack Soloff – a conflict that Louis and Donna can’t seem to stay clear of. Mike brings in Robert Zane to co-counsel a case, pitting his instincts as a lawyer against his desire to stay in his future father-in-law’s good graces. And while Jessica mediates between Mike and Zane, she tasks Rachel with an unusual assignment.
A surprise skitter attack leaves the 2nd Mass without food. In desperation, Maggie, Ben, Pope, and Sara go on a dangerous mission hoping to find supplies.