Orphan Black

Sarah pursues the missing Helena who is held in a faraway compound. Meanwhile, Cosima appears to be rebounding from her illness, while Alison and Donnie face newfound financial woes.

Castor pursues the Leda clones for original tissue samples. Helena, who is pregnant and imprisoned, is examined by a mysterious new villain.

Leda and Castor are both on the hunt for original clone DNA. On-the-lam, Mark and Gracie pursue new leads to find the samples that might set them free, while Art and Sarah reunite to track them down.

Mark is taken down in a Prolethean shoot-out and Sarah must step in to help. But as Sarah gathers intel that puts her on the trail of the original Castor DNA, a familiar foe is not far behind.

Helena and her sestra are reunited at the Castor camp when Sarah is captured. As Sarah suffers testing, Paul appears to chide her; but his allegiances are beginning to strain.

Paul digs and finds the ugly truth behind the Castor Boys' logbooks of names, pushing him into action.

Alison must secure a store front in order to take her and Donnie's business to the "next level".

When Rachel makes a promise to Sarah, it comes with a hefty price. Meanwhile, Helena and Gracie work with the Hendrixes, and Donnie takes Kellerman to task.

Sarah, Felix and Mrs. S take a trip with the hopes of tracking down the Castor Original. But they are not alone.

As Clone Club races towards the truth, Castor and Topside force Sarah to make uneasy alliances.