Sid joins the double line of second-shift workers entering the plant. The guard who's not the one in the photo waves him over, but the right one steps between them and waves Sid in. Ooh, close one, if I cared.

The rain starts again. Kyle, sitting in the SUV with Erica and Jack, spots Ryan sneaking toward the gate. Jack wonders what he's doing there, and Erica says she's not waiting around to find out." So the Fifth Column jumps out of the truck, guns drawn, to protect this operation that the Fifth Column can't be seen to be involved in. Inside the site, the rain has turned to snow when another V guard roughly grabs Sid from behind. Luckily it's just their inner contact, but he really needs to work on his people skills. He enters a key code and lets Sid into the reactor building. Outside, Ryan sneaks up behind a perimeter guard and delivers a flying punch to the V's brainstem. Serves the guard right for facing the thing he was supposed to be guarding instead of outward, where the threats come from. Sid makes his way through the bowels of the building wearing an MTV's Fear-cam. Ryan, now inside the grounds, runs through some handy culvert sections to follow him. Sam makes it into the room where the reactor's core lives, an unstaffed room behind an unlocked door. The core is basically a pair of big glowing blue balls with an old-school Kryptonian restraint circle whirling around its center. Topside, the team continues pursuing Ryan through the grounds. Considering how much work they put into sneaking Sid in undetected, they don't seem to have much trouble running around without anyone noticing. Although at one point, they do have to remain undercover as Ryan attacks the Fifth Column guy who's guarding the reactor building for Sid. Lucky for Ryan, nobody else seems to be guarding the reactor building, inside or out.

Sid approaches the core -- which just gets to stand there and do its thing unattended 24/7, I guess -- opens his toolbox, and removes the blue energy balls and a remote detonator. He holds up the balls and lets them float freely into orbit around the main core, where their blue halo activates. Did they really need Sid for this job? My six-year-old could do that, and his Nobel prize isn't even in physics. Just then is when Ryan walks in, telling him to stop. Sid picks up the remote while Ryan slowly steps closer, warning him that he's about to kill them all. Sid doesn't trust Ryan, but Ryan just asks him to be 100% sure he hasn't weaponized the blue energy. Sid's not, but when Ryan makes a dive for the remote, Sid hits the button anyway in the moment before Ryan tackles him. The core starts freaking out. "You have no idea what you just did," Ryan says, like that's unusual for anyone on this show. In burst Erica, Kyle and Jack, who apparently had no trouble getting past the nonexistent security. Sid says it's going to blow, and Jack suggests maybe getting out. "Not until we take care of some unfinished business," Kyle says, leveling his gun at Ryan, because just because they're all about to be torn apart by alien forces beyond their ken doesn't mean he has to go all wussy. Ryan argues that he's here to save them -- they need to deactivate the reactor before it kills tens of thousands in an explosion. And if he doesn't trust him, what about Lisa? "She sent me here to warn you." The core gets louder while Erica keeps holding her gun and Jack asks Sid if he can stop it. Sid doesn't know how. Ryan offers to shut it down. Kyle insists they can't trust Ryan, but Jack argues, "Tens of thousands dead? Can you live with that if you're wrong, Erica?" Well, she won't have to, because she'll be a drifting cloud of poorly CGI'ed blue ash, but she gives the order to shut it down anyway. Ryan activates to a holo-console while Sid yells at him to let the energy vent or dump or whatever, like he's such a big expert now. Ryan makes with the holo-fu. Lisa's blue balls drop free and Sid picks them up from the floor (and I'm sure Lisa would be thrilled to know how close she came to never getting them back), but there's still a lot of cheesy blue strobing to do as the core goes all China Syndrome.