Plot summary
Rachel appoints Delphine as Leekie's replacement for director of clone research. Learning that Kira's bone marrow might save Cosima, Sarah asks Kira to donate some, and Kira agrees. As Alison and Donnie work to bury Leekie in their garage, Vic returns to either blackmail her or discover new dirt for Angela. Suspecting that Angela's operation is not official, a newly assertive Donnie confronts Angela to chase them both away. Burying Leekie causes the couple to have a newfound passion, and they have sex. Helena and Gracie are implanted with Helena's eggs fertilized with Henrik's sperm. Helena finds out that Henrik intends to impregnate several other women with Helena's eggs. Helena helps Gracie and Mark run away while she kills Henrik and burns the farm down. Rachel, disillusioned at the prospect of not being able to have children, tricks Delphine into distracting Sarah while Rachel, posing as Sarah, abducts Kira.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.