The Connor Crew needs to get back the severed hand of the T-888, lest authorities reverse-engineer the technology involved to create Terminators, in that awesome time-loop paradox, wherein it"s the technology from the future that causes the actual invention of the technology, one of those things that if you think about too much, you will start to bleed from your ears.
The hand, though, isn"t part of Agent Ellison"s official investigation, because everyone already thinks he"s crazy enough, so he"s investigating this more or less on his own. He tracks down Dr. Silberman, who is now known as Dr. Silverman (and Earl Boen"s streak comes to an end), and -- this is nice for him -- his hair has grown back! He"s gone kind of cuckoo for cocoa puffs, and ties Ellison to a chair and jams a knife in Ellison"s leg to make sure the unlucky agent isn"t actually a Terminator. Ellison shows him the severed hand, and Silverman is all, "Great -- this means I have to kill you to death," and sets fire to his own house. Sarah"s the one who saves Ellison from the fire -- he sees her, but judging from his bible-study group participation during the denouement, it"s possible he thinks it might have been a hallucination. Whether he"s coming around or not, you don"t screw with Agent Ellison: he has Dr. Silverman thrown in the nuthouse.
Meanwhile, Cameron tracks down Dmitri Shipkov via his sister, who"s a ballet teacher. In an amazing coinicidence, Summer Glau is a ballet dancer herself, which must have come in handy. Dmitry owes some men some money, and Cameron gains her ballet teacher"s trust, and then finds out from Dmitry that he stole the Turk and sold it. After getting the contact info, she reneges on her promise to help, and Dmitry and his sister are killed. So she"s not exactly the Terminator version of The A-Team.
Oh, and John discovers that while his mother was incarcerated in a mental institution for her anti-Skynet activism, she signed away her parental rights, and he cries like a baby about it, because I guess she hasn"t demonstrated time and time again what a ferocious mama bear she is. Fortunately, they work it out by the end of the episode, which I hope means he won"t be sniveling all through next week"s finale.