Plot summary
Sarah, Kira, Mrs. S, and Kendall flee Iceland. Helena learns she is having twins which causes Alison to yearn for her own children. Cosima is upset about Delphine's disappearance. Sarah determines that to learn about Neolution they must contact M.K. Knowing Beth was in contact with her, Sarah and Art investigate Beth's final days. They discover Beth was spying on Paul and had contact with Trina. Sarah and Felix go to the Neolution club, where they argue when Felix reveals he has been searching for his birth family. Sarah encounters Dizzy, who mistakes her for M.K. and shows her a video of an operation on a Neolution follower which kills him when the cheek implanted bot is ruptured.
She tries to meet M.K., who reveals she feared 'it' would kill Sarah like it killed Beth. In flashback, Beth tells M.K. to "watch the others". Neolution paramedics attack Sarah, believing her to be M.K., but retreat when they discover it is actually Sarah. Sarah later discovers she has a bot implanted in her cheek. Kendall reveals to Scott that she has leukemia.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.