Watch the newest trailer for "Orphan Black" season four

Tatiana Maslany as Sarah from "Orphan Black."

BBC America

"Orphan Black" is returning in April for its fourth season, and a new trailer is out; fans will be happy to see it's the most revealing teaser yet for the upcoming season.

You can see the many faces of actress Tatiana Maslany (along with other familiar faces, like her brother Felix and her daughter Kira) when the season premieres on April 14 at 10 p.m. on BBC America, but for now, whet your appetite with the trailers for one of TV's hottest sci-fi shows.

In the newest season, protagonist Sarah Manning goes "back to the beginning of all this" and searches for a mystery ally linked to her clone, Beth Childs.

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