<p>The <em>Orphan Black</em> series finale really started cooking with gas when the Core Four Leda sestras gathered in Alison's backyard to celebrate the birth of Helena's twins. It was an extended sequence that the show — and star Tatiana Maslany (as well as her hardworking double, Kathryn Alexandre) — had been building to over the course of the entire series, with the main cast of clones seamlessly mingling and sharing the same frame for almost 20 minutes. It's a uniquely satisfying moment that no other show will ever be able to clone. —<em>Ethan Alter</em><br />(Photo: BBC America) </p>
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