In the present day, Anne, while dying, is all, "So you're from the future," she says. She's pieced together that if he knows her daughter in the future, then she must make it. Derek says there's an immunity in Sydney's blood. She saves a lot of people. This makes Anne happy, and she asks if Sydney saves Lauren too, but before Derek can answer, Anne starts gasping again.
Six months ago, Lauren is hiding in the closet when someone goes for the door. She cowers behind some coats, but it's only Roger -- who then gets incapacitated by Cameron, who looks like she's feeling all better. "He's human?" says Cameron. "Of course!" yells Lauren. "My mistake," says Cameron, not exactly looking broken up about it. She gives Lauren her hand.
Meanwhile, Anne and Sarah are being chased through the woods by the terminator, and they're fortunate to cross the road at exactly the right time for Cameron to hit the T-888 with a Jeep. Anne and Cameron pile into the Jeep with Lauren, Cameron and David. The terminator chases after the Jeep, but since no one can really do what Robert Patrick did, the Jeep quickly loses it.
Back in the present day, Anne's still screaming. "She's fully dilated," says Lauren, who became an obstetrician when no one was looking. It appears Derek's going to have to deliver this kid.
So of course, he does, and it's fine, and Lauren brings the little purple thing over to her mother who smiles and has a look, and then lays her head back down and dies. Just like that. Lauren's face gets lumpy and she leaves.
In 2027, it looks like the daylight return to Serrano Point was uneventful. At any rate, if anything happened, we don't get to see it. All we get is a dialogue-free slow-motion scene of Derek, Jesse and Sydney being greeted by Hazmat suit wearing soldiers, including General Perry, who gives Derek the Solemn Nod of Respect.
In the present day, Derek pulls a sheet over Anne's head. Next to him, Lauren rocks little baby Sydney. Lauren, I hope you're able to lactate.
Back in 2027, Derek and Jesse are side by side in field hospital beds. Jesse asks Derek if he knows what Oscar Wilde's last words were. "'Either the wallpaper goes, or I do.'" Derek's too busy having trouble breathing to appreciate Wilde's last perfect quip to give a shit. "I thought it'd be over by now," he says. Jesse, in the same difficulty he is, tells him he's ready for it. Nuh-uh, says Derek. "Then what were you doing when I found you outside Eagle Rock?" she says. "I think ... I was waiting for you," he says. Smooth. His chances of getting laid just skyrocketed. Assuming he lives. And assuming Jesse lives, which is looking less likely as she starts hacking up a lung.