So the Fringe team saddles up with big guns and a carton of wriggling larvae. Walter cautions Peter to be careful with the larvae, and Peter snidely says he wouldn't want to hurt the "monster babies," and slams the carton down.
Olivia asks Charlie if he needs anything, and he asks for a shot of JD and a chaser of beer, before getting serious and telling her that hunting the thing in the sewers isn't a good idea. "Don't get hurt for me," he says, and she tells him that's not a fair thing to say because he would do the same for her. Hey, you know what would be a good idea? CALLING CHARLIE'S WIFE. Everyone saddles up to go, while Walter secretly takes a bottle of trichlorimide while ominous music plays.
So out on the sidewalk somewhere, the gang finds a manhole cover, which Walter says will make a "fine infiltration point" -- like, it's not exactly Fort Knox, Walter -- and passersby are watching the crew because they look less like a public works crew than a ragtag bunch of bank robbers planning their next heist.
Once underground, Walter leads the way to an intersection that he says will "conduct the sound most effectively." He explains that the larvae are conducting a vibration: "Frequencies of sound detectable by bats and hopefully our guest of honor." They get to the spot, and he puts the carton of larvae down on the ground and uncaps it. Peter says he now knows what it feels like to be live bait, and I can only imagine that after 20 minutes of Peter's wisecracks, I'd be offering myself as live bait to the creature.
So finally Charlie has realized, "Hey, I might be DEAD soon, I suppose I should give my wife a call," and he calls home just as she's arriving home from the market, where she ran into Jody. And from what I can tell, Jody is this annoying woman with a supply of corny jokes from the '50s, and Sonia tells Charlie one about a doctor asking if he'll live longer if he gives up "wine, women and song," and the doctor says, "Well, no. But it'll feel longer," and Charlie is in too much pain and also presumably annoyance to laugh too much at that antique, and can only muster a kind of wheeze-laugh, and she pouts that he didn't think it was funny, but he says that he did, and then she asks if he's going to be home for dinner, and instead of saying, "Probably not, and probably not ever again," Charlie just says he doesn't know. Sonia says she'll see him when he gets home, and she tells him that she loves him, even more for laughing at that joke. Charlie says he loves her, too, and they hang up, and then Charlie continues to lie there dying alone. Well, except for Astrid. Hey, maybe he doesn't want his wife there so he can keep checking Astrid out.