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Season 2 ends with Sarah being forced to concede when Rachel launches her latest ploy. However, the Clone Club springs into action to save her. Later, Sarah meets a new ally and uncovers a terrifying new dimension to the conspiracy.
Sarah becomes frantic when Cosima's health take a down turn, but her actions have heartbreaking costs for the others. The Proletheans implement their fundamental plan. Complications with the law involve Alison and Donnie.
Sarah joins forces with an unlikely ally, when she follows a trail of clues that she hopes will lead her to the origins of the clone experiment. Meanwhile, Cosima and Delphine make a discovery that could prove to be the key to treating Cosima's illness.
Rachel goes on the warpath and lashes out at Sarah's loved ones. While Sarah tries to keep them safe, an unexpected visitor threatens to derail her plans.
Sarah comes home to search for answers and with Cosima's help she digs into the origins of the clone experiment. The hunt takes her into perilous territory that could cost her more than she realizes.
While Alison struggles with Aynsley's death and Cosima grapples with the worsening symptoms of her mysterious sickness, Sarah enlists Art's help to find Kira and is shocked when she learns where the trail leads.
With Sarah out of options, she's on the run and being tracked by deadly adversaries. She suspects that pro-clone Rachel is behind the disappearance of Kira and ignites all out war against her. Allison sinks into guilt and depression after attending Aynsley's funeral. Cosima is confronted with a decision that could have calamitous results.moreless