The Castor clones come out to play in this week’s episode of Orphan Black, and their definition of “play” is just plain horrible. Plus, while most of our Leda clones are scrambling to survive, one decides to start up an illegal side business.

After all of the madness of last week’s episode, it really feels like the Castor storyline is starting to gel this week. At center stage in “Transitory Sacrifices of Crisis” is Rudy’s relationship with Seth, the mustached clone who liberated Rudy last week. The two clones immediately go back on the prowl, but this time their target isn’t a Leda clone; it’s another woman entirely.

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We learn later that Rudy seduced this lady in order to get a sample of her hair. We also know that the Castor clones are trying to find the source of their original genome — do they think this woman might be related to their genetic source?

If so, that’s not half as gross as the way Rudy and Seth treat the woman. They decide to play with their food, with Seth pretending to be Rudy when the woman’s back is turned and then pawing at her while she and Rudy are having sex.

Fortunately, she reports the sick encounter for the police, bringing Arthur into the clone conspiracies once again. You know, some of these secrets would get uncovered a lot faster if Sarah bothered to keep Art in the loop.

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We also learn a bit more about the “glitch” in Castor’s biology. Paul shows up to administer a neurological test to the clones, studying Seth’s response as he runs through a series of simple logic problems. Seth doesn’t do so well and Rudy notices.

This episode also clarifies Paul’s role in all this. Paul has been hiding under layers of deception — spying on Beth for Dyad and spying on Dyad for Castor — all in hopes of getting closer to the original genome. Now he’s also responsible for Castor clones in the field, although that responsibility doesn’t mean he’s going to keep them from being creeps. (Or keep them from getting discovered; even the Leda clones try to avoid being seen together.)

Let’s turn to some nicer characters. Can we talk about how adorable Scott and Cosima are together? Cosima has been teasing Scott since Season One, but now they’re great buds. And maybe Felix is stirring some happy feelings in Scott as well?

I’m also rather intrigued by Dr. Nealon. He seems a bit more about the science than Dr. Leekie, who had his own little cult of personality going on, but at the same time, he’s unfazed by the violence of Rudy’s escape. He’s a weirdly cool cat and I’m curious to see what happens with him.

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I’m also a bit curious (if wary) about Cosima’s sudden interest in mysticism. It makes sense that she might start thinking outside of her usual scientific strictures after her near-death experience, but I’m wondering if there’s going to be more to it — especially since she connects it to Kira, who has always seemed a little mystical herself.

And then there are the Murder Hendrixes.

Donnie is still unemployed and Alison still wants to run for school board trustee. So she turns to a wholesome means of raising funds: drugs. It turns out that Ramon the “gun enthusiast” is going off to college, so Alison decides to buy up his weed and pill business. Donnie gets on board only after he realizes that Alison intends to use Ramon’s client list to extort their neighbors into voting for her. Once you and your wife have hidden a corpse together, peddling drugs isn’t quite enough to get the juices flowing. You need to slap a little extra deviousness lube on that thing.

This will not end well for the Hendrixes. It will end well for us, though, because this should be hilarious. After Alison’s gun delivery, I can’t wait to see how she packages other people’s quaaludes.

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While Alison thinks she’s a badass for becoming a drug dealer, actual badass Helena is being “stress tested,” which is a nice way of saying Team Castor is torturing her. At least Castor Mama Dr. Coady puts a stop to the waterboarding once she realizes Helena is pregnant.

Dr. Coady is trying to break down Helena’s loyalties to Sarah and company, but it seems that she views Helena much the way that Cosima accuses Dr. Nealon of seeing her: as data. But it will be interesting to see if Helena feels any connection to the “Mark-faced boys.” After all, Dr. Coady is right about one thing: her upbringing was a bit similar to theirs.

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While Sarah is still trying to figure out what happened to her sister, the rest of her family isn’t looking completely solid. Sarah is still dealing with Siobhan’s betrayal, for one thing. Now that the wall of secrets has started to break down between Siobhan and the children she raised, her language has gotten more and more maternal. She calls Kira her “granddaughter” and refers to Felix and Sarah (at least we assume it’s Felix and Sarah) as “my children.”

But even though Felix describes her as “being weirdly straightforward,” there are some things that Siobhan is holding back — like what actually happened in London. We’ll learn all your secrets yet, Mrs. S.

Oh, and there’s the business with Cal.

Ready to step into domestic mode (even with clone business flying about everywhere), Cal rents an apartment in Toronto complete with dad stuff. But of course, Sarah can’t have anyone in her life who isn’t keeping secrets (except, hopefully, Felix). It turns out that the story Cal spun about going off the grid after his pollinating drones were turned into weapons wasn’t entirely true. Dude made a good chunk of money knowingly building and selling weapons.

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Paul shows up to tell Cal that Castor knows his dirty little secret — and it won’t stay a secret long unless Cal gets Sarah and Kira out of dodge and away from all this madness.

Paul is likely desperate to protect Sarah because he knows what horrors Rudy is capable of. We’re meant to understand that Rudy is a twisted form of Sarah — someone who will do anything for his brothers. (He even draws Xs over his eyes in imitation of Felix’s “memorial” painting of Sarah.) In Rudy’s case, “anything” includes tormenting women and threatening small children.

When he realizes that Seth is suffering from the Castor glitch, Rudy’s desire to find Ethan Duncan’s research grows more urgent. But he abandons his mission when Seth starts melting down outside Felix’s apartment. And, in a moment that suggests Rudy has some actual humanity, kills Seth as an act of mercy. Felix and Sarah are going to need Alison’s corpse disposal advice, it seems.

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Sarah, who is used to succeeding by her wits, got very, very lucky this time, and she realizes that this may not always be the case. She sends Kira off to Iceland with Cal.

And, in case we forgot about them, the episode ends with a brief scene with Grace and Mark. Grace, of course, is still pregnant with Helena’s child and she doesn’t realize that Mark is a clone. And Mark, hoping to sever ties from Castor once and for all, burns off his horse head tattoo in the bathroom. I guess it hurts less than hanging out with the likes of Rudy.

Orphan Black airs on Saturdays at 9 PM on BBC America.