Okay, let's do this. The series finale! I'm sure it will be delightful, and not at all a ridiculously disappointing cliffhanger and anticlimax! After all, the show is called The Event. Surely nobody would open themselves up to the obvious jokes that would happen if they ended the show without an actual Event.
...or would they?
Sitting in her plastic medical tent, Leila starts to nod off. Sean makes her stay awake, because he has some kind of theory that Spanish Flu can't kill you if your eyes are open. It's like sneezing. Sean says that Sterling has called a specialist form the CDC. Is this person a specialist in treating half-alien hybrids? Because it seems like that's what would be required. And isn't Sterling currently the most wanted person in the country, according to the directives of Acting President Jarvis? In that situation, it might not be a good idea to bring the CDC into this. Leila says that no one can survive this flu, but she's only basing that on what Doctor Lu was saying. And anyway, as a human-alien hybrid, she was just as likely to be immune to it. Everybody's guessing. Sean thinks that because her alien half is immune to the disease, she has the power to fight it. I'm not sure that's how immunity works. She asks him to look after Samantha, which is far too late to make us think that the writers didn't completely forget Samantha exists. The CDC people arrive in enviro-suits to take Leila away. Sean promises to find Samantha, which he isn't going to do. This was the last time Samantha would ever be mentioned.
Sterling is studying Lu's laptop. There's a graphical representation of the superflu spreading across the world, and it has a handy slider that he uses to rewind to find where it was going to spread from. So now they know the three spots: a food place, the Bureau of Engraving, and Dulles airport. Simon characterizes this as "Food, money, and travel," like he's got some sort of Maslow's Hierarchy of Needs theory. It will also be helpful for Our Heroes to know that the virus will be spread via pressurized aerosol containers.
In a black SUV driven by Carlos, Sophia checks her bag to make sure that her aerosol container is still there. I'm kind of surprised she's going to be releasing the virus herself, since she's got hundreds of faithful followers. Fewer than she used to have, sure, but there should still be enough people to let her delegate some of these tasks. She has Carlos pull over to the side of the road so she can get out and check her watch. That seems like the sort of thing she could have done inside the vehicle, right? But then! There's an unexpected earthquake, which is represented through the traditional method of shaking the camera. It looks like the entire planet is shaking, which makes that whole NSA satellite subplot fairly pointless. You don't need a satellite to know that Washington, DC isn't supposed to be joggling up and down like that. A few cars crash into each other, although it's not clear why. There aren't any giant fissures in the ground or anything. Apparently the drivers felt the earthquake and reacted by stomping on the gas and then slamming on the brakes. Maybe they were trying to turn the earthquake into a rollicking thrill ride. Sophia tells Carlos that the portal's effects will be felt along the 38th parallel, which I happen to know is the dividing line between North and South Korea. Or it was during the Korean War. Or so they said in M*A*S*H. Carlos soothes Sophia, telling her that she doesn't have a choice about all this, but she isn't actually displaying any self-doubt at the moment. That was weird.