Tatiana Maslany Tatiana Maslany

Talk about exhausting!

That's how Orphan Black star Tatiana Maslany must feel after a day on set. See, in BBC America's twisty new sci-fi series (airing Saturdays at 9/8c), Maslany plays Sarah Manning, a streetwise hustler who assumes the identity of a dead stranger who looks similar to her. It turns out, however, that her doppelganger is actually her clone, and there are more of them, which means Maslany is sometimes tasked to take on at least three roles in one scene at any given time.

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How does Maslany pull off playing Sarah, soccer mom Alison and evolutionary biology student Cosima at once? Check out an exclusive behind-the-scenes look at Orphan Black below:

Orphan Black airs Saturdays at 9/8c on BBC America