This episode has lots of previouslies, because they skipped a week right when things got complicated. I think it's too late for that sort of thing, which is part of the reason that shows like The Event can get in trouble. If you're just now tuning in, you're not going to catch up. Unless you read all the recaps, anyway. You're not going to get caught up by watching a few minutes of random images from the series so far.
For example, we start with someone we've never seen before. It's like this show goes out of its way to keep viewers from knowing what's going on. Whoever this is is some kind of scientist, because he's wearing safety goggles. He's also got a goatee, but I don't think that means anything. He's got a cylinder made of ice that he took out of a big freezer filled with other cylinders of ice. Outside, there's a SWAT team and an FBI agent getting ready to bust in there. They plan to take Mr. Scientist alive. All the scientist is doing is slicing a disc off the end of the ice cylinder, in much the same way that Val Kilmer does in Real Genius. But unlike Val Kilmer, he does not use the cylinder to get a free soda. Instead, he just looks at his cylinder under various high-tech doodads. Then a beeping noise alerts him to the SWAT team currently running through the hallways. He's getting plenty of warning here.
Sophia's iPhone goes off. I can't believe she's still using an iPhone. Hasn't she heard the news about how it tracks her location? That seems like exactly the sort of thing that a fugitive alien doesn't want going on. She's being called by Scientist Guy, who tells her he's on the verge of a breakthrough but is about to be invaded. She tells him he should send her his results, but he can't leave any trace of what he's been working on. Oh, and he's named "Herbert," which is basically like being named "Scientist Q. Scientist." You'd think they could use their magical portal technology to bring him over, but apparently those only work when the stars are in alignment. So he hangs up and runs around pulling levers that emit steam. The ice cylinders melt really, really fast. He also types frantically on computers, which is how you delete everything. Finally, the SWAT team busts in so one of them can shout, "Herbert Mills, you're under arrest!" Then Herbert the Scientist jumps out the fourth-floor window rather than surrender.
Sophia no longer cares about her peoples' moral code or anything. She's holding another of those council meetings where the attendees are most of the aliens that have gotten names, along with a few others thrown in for variety. She says that she has to "affect change" and "winnow" the "native population" to make room for her 2.5 billion people. Herbert Mills (you might remember him from such paragraphs as "the one before this one") was working on something, but he had to kill himself. She assigns someone to start working on whatever Herbert was working on, which will give them a weapon against humanity. As a member of humanity myself, I think I have to object to this plan. Someone complains that if the US Government could find Herbert, they could find the gated community they're hiding out in. They sure could! Especially if people keep using their iPhones. Sophia agrees that the government will become a problem. She doesn't come up with my brilliant plan, which is basically that they should all move to a different country, ideally one that isn't actively looking for aliens in their midst. But instead, her plan is to kill President Martinez. Surely that will make everything better!