Tonight on Teen Wolf season 5, episode 15, “Amplification,” Scott, Stiles, and the rest of the pack make plans to free Lydia from Eichen House.

Last week on Teen Wolf, Malia gave up the chance to chase after her mother, the Desert Wolf, in order to save Deaton from The Beast. She brought the vet back to his office in Beacon Hills and back into Scott’s life, for which he was grateful.

At the end of the episode, we saw the gang gathered around a schematic of Eichen House, the asylum where Lydia is being held. Mrs. Martin may think she’s doing something good for her daughter, but Stiles and the others know how bad of a place Eichen can really be.

In one of the sneak peeks MTV released this week, we see a confrontation between Theo, Stiles, and Scott. The two best friends don’t trust Theo, to say the least, but Theo’s logic is sound. He’s willing to help them break out Lydia because he doesn’t want to end up on the wrong side of this equation either. His goal is to survive — by any means necessary.

Stiles has some choice words for Theo, especially since the chimera in question shot his ex-girlfriend in the gut last week, but Scott seems a little more reserved in his distrust. He’s willing to hear Theo out, and maybe even work with him, but it’s doubtful that Scott will truly ever believe Theo is a good person. He only looks out for himself, no matter the consequences, which is pretty much the complete opposite of the kind of person Scott is.

Valack is also up to something interesting this week, and it involves what looks to be a Dread Doctor’s mask. Valack has never been an out-and-out good guy, but he has been trying to help Lydia with her powers and her memories in order to find a way to defeat the Dread Doctors. In that case, what could this mask be helping him to do now?

Find out tonight on Teen Wolf season 5, episode 15, “Amplification,” airing on MTV at 9:00 p.m. ET.