Day 6 begins with Alan mourning Doreen's death while her killer, Balleseros, is saved from his icy ax-induced doom.
Alan returns from the base to find Sarah moving her recently euthanized patient. Alan doesn't ask a lot of questions but focuses on getting Julia out of the isolation floor, where she is showing more symptoms including hallucinations. She asks Hataki why he enabled her visions of Jaye. He says he did it because Jaye seemed to calm her nerves.
Daniel is against anyone going to or from isolation so Alan and Julia make the trip in secret. Alan uses science to burn a hole through a metal grate, a trick he picked up in his time as a genius teen prankster. He and Sarah come to double doors chained together. As they attempt to open the door they are approached by vectors, one whom grabs Sarah's shoulder, forcing Alan to saw his arm off. Alan says that they will have to treat the vectors before they can get to Julia.
Balleseros awakes inside, handcuffed to a couch. His savior, Anana, enters and reveals that she is the only law enforcement around. Balleseros reaches for the scissors that his captor conveniently left just within arm's length. She stops him and says that she wants information on Arctic BioSystems.
In the lab Alan and Sarah discover that the virus is a genetic delivery system, which Doreen found out on Day 4 before she was killed. Hataki gives Julia a sedative before he goes through a secret tunnel back upstairs, just in time for Alan to confront him about the new information. Hataki says the virus was created as a cure for cancer, but that the intended package is not in the virus and he has no idea what is in there.
In Hataki's office Daniel tells him that he killed Balleseros. Hatakis gets angry at his son and slaps him, saying that Balleseros' failure to check will be the reason "they" will come.
Meanwhile, Julia wakes up in a dream, where she is in a cabin with Peter and a little girl. Peter suggests that she direct her questions to the girl. When she does, Julia realizes that the girl is herself and the cabin is her childhood home, then she continues to brag about being from Montana.
In the lab Alan and Sarah have a work montage to song from The Nutcracker. They experience the same black substance that Doreen did in Day 3, completing two days of her work in a few hours. Alan turns a fire extinguisher on the substance and it stops. He says that cold will help fight the virus and they need to put Peter on ice. Sarah points out that there is a cryogenicist on the base.
Balleseros puts his hand around Anana's throat when she goes to put his blanket over his chest. She gets the upper hand again and shows him pictures of children that have gone missing. She says that 31 children have disappeared in the past 2 decades near the base.
Alan goes to the cryogenesis specialist, Dr. Adrian who is drinking vodka and watching The Three Stooges on his laptop. Adrian agrees to help if Alan promises the guards will back off and he can be first in line when the cavalry rescue team arrives. He then shows Alan a tank of infected rats swimming in cold water.
When Anana goes outside, Balleseros picks his handcuffs. He goes to the window and sees Anana embracing a man who looks exactly like Daniel. After Balleseros puts a knife to the man that he thinks axed him Anana reveals that it is her brother Tulok. She says that Tulok had a twin brother who went missing as a child. She says that she wants to go with Balleseros back to the base, although she doesn't seem to know about Daniel.
In Julia's dream cabin another Nutcracker song plays as Peter brings out a turkey and Julia sits at the table for a surreal family dinner with Peter, Alan, Hataki, Balleseros, and Sarah. When Julia carves the turkey it bleeds black and everyone laughs.
In the lab Adrian applies his cryo technique to Peter. He fills Peter's suit with cold water, filling his lungs and exposing him to cold inside and out. Afterwards, Sarah tells Alan that Peter is improving. Then the two kiss and go to Alan's bedroom.
Daniel and Hataki go outside to look at Balleseros' body, but find he is gone. They look up to see the approaching helicopters of the Ilaria corporation. Back inside Julia wakes up for real and is no longer showing symptoms of the virus.


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