Complete story — includes the ending
Sarah learns from Art that Rudy and Seth assaulted a woman in a hotel and took a lock of her hair. Seth is revealed to be suffering from a degenerative disorder. Helena is being held in a controlled military zone and subjected to testing where her captor Doctor Virginia Coady learns of her pregnancy. Rudy and Seth search for the original clone tissue in Felix's apartment. Rudy holds Kira hostage to gather information from Sarah; he does not believe Sarah's claims that Ethan Duncan did not leave original tissue samples with her. When Seth suffers a seizure outside while holding a knife to Cal, Rudy retreats and ends Seth's suffering by killing him. Realizing Kira is not safe with Sarah, Cal moves with Kira to Iceland while Sarah goes to look for Helena. Meanwhile, Cosima and Scott work with Dr. Nealon to understand Cosima's recovery, despite her and Scott's lack of trust for him. Alison and Donnie hatch a plan to turn the tide for her campaign by buying Ramon's drugs.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed. · Content license