Orphan Black

Sarah suspects ruthless pro-clone Rachel is behind her daughter's disappearance and sparks an all-out war against her.

Alison struggles with Aynsley's death as Cosima's symptoms worsen. Meanwhile, Sarah enlists Art's help to find Kira.

After hitting the road with Felix, Sarah and Kira are forced to seek refuge at the home of one of Sarah's former lovers, Cal Morrison.

With Cosima's help, Sarah digs into the origins of the clone experiment, and the hunt takes her right into the belly of the beast.

Rachel's vendetta against Sarah endangers the lives of those around her target, leading Helena to launch an offensive of her own.

Cosima and Delphine uncover genetic abnormalities at the Dyad Institute, and Sarah reluctantly unites with Helena to track down Ethan Duncan.

With Family Day at the rehab center looming, Alison discovers that Vic has plans to reveal the truth about her involvement in Aynsley's death.

Felix protects Tony, a transgender clone, who arrives with a critical message about Paul. Meanwhile, an ailing Cosima is running out of options.

When Cosima's condition worsens, Kira undergoes bone marrow extraction. Meanwhile, Rachel begins to devolve psychologically.

Helena is abducted; the Clone Club plots to rescue Sarah; and Marion divulges devastating truths about the clone program.

While Sarah pursues the missing Helena, Cosima appears to be rebounding from her illness and Alison and Donnie face new financial woes.

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

As Leda and Castor hunt for original clone DNA, Mark and Gracie look for samples that could set them free while Art and Sarah try to track them down.

When Mark is taken down, Sarah steps in to gather intel that puts her on the trail of the original Castor DNA. But a familiar foe is not far behind.

Helena and her "sestra" Sarah have a bittersweet reunion at the Castor camp, Paul's allegiances are tested, and Mrs. S and Felix look after Gracie.

Paul discovers the ugly truth behind the Castor Boys' logbooks of names, pushing him into action. Meanwhile, Felix desperately tries to find Sarah.

Alison must secure a storefront in order to take her and Donnie's business to the next level, but things don't go according to plan.

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

Sarah, Felix and Mrs. S search for the Castor Original in London, while back at home, Donnie tries to save the family business.

As Clone Club races toward the truth, Castor and Topside force Sarah to make uneasy alliances. Donnie gives Helena an unexpected "gift."

Following a tip from a secretive fellow clone, Beth Childs begins poking into the world of Neolution and makes an alarming discovery.

After fleeing Iceland, Sarah begins searching for M.K. and uncovers new clues to Beth's breakdown. Scott learns Kendall Malone is hiding something.

As Sarah scrambles to learn more about her implant, Alison and Donnie take a drastic step to help. Meanwhile, Kira has a disturbing vision.

While Cosima examines Leekie's bot, Felix and Donnie pose as a couple to learn more about a fertility clinic. Sarah discovers M.K. has her own agenda.

A risky undercover mission at Brightborn yields several big surprises. The rift between Sarah and Felix grows as she checks up on Adele.

Sarah and Cosima weigh a radical proposal that could bring them both relief, but at great risk. The full story of the night Beth died finally emerges.

Sarah begins to spiral out of control. Scott tries to talk Cosima out of a rash move. Rachel discovers that her circumstances have changed.

With Donnie in jail, Alison faces an ultimatum from Duko. Meanwhile, Cosima finds a new path to a cure, and S seeks revenge for her mother's fate.

Sarah and Rachel reluctantly join forces to battle Evie Cho and track down two women who fled Brightborn. Helena returns from the wilderness.

A sudden power shift within Neolution has dramatic consequences. Sarah heads to the island after a scientific breakthrough puts Cosima in danger.

Sarah struggles to survive on the unforgiving island, while Cosima adjusts to life in the village. Back home, their family members face new threats.

After meeting with the mysterious P.T., Rachel makes Sarah an offer she can't refuse. An old ally emerges from hiding to help Kira.

Mounting pressure from Neos and memories of the past send Alison into a reckless spiral at the church fun fair -- and lead her to a big decision.

Alarmed by the changes in Kira, Sarah and Siobhan embark on an undercover mission. Cosima resolves to find out what's lurking in the woods.

Cosima questions Delphine's loyalties and uncovers the truth about the "creature" terrorizing the village. Neolution's plans for Kira become clear.

Krystal returns with a surprising piece of intel. As tensions rise in the village, a new arrival at the house pushes Susan to her breaking point.

With hours to go before Kira's procedure, Cosima races to expose the truth about P.T., and an unsettling discovery sends Rachel into a tailspin.

After urging the sisters to take a night off to celebrate Felix's art opening, S forges ahead with a secret plan to bring Neolution to its knees.

As Sarah and family come to grips with a tragedy, disturbing news about Helena drives them to undertake another perilous mission.

In the series finale, a dramatic showdown unfolds in the halls of the old Dyad building as Sarah, Art and Helena mount a last stand against Neolution.