This week we've got a gross but fun squid-alien bursting through the mouth episode of the week to start off. Although it doesn't have much meaningful impact, it's full of horror and good character work. After that, we've remembered we're dealing with a major problem: frozen head guy is back and causing trouble. He's going around de-braining people in order to re-brain Walter, which he ultimately does. He plays Olivia because he knows she's got a heart of gold, even after she straight kills his whole team.