ATTENTION: CONTAINS SEASON TWO SPOILERS!

The clones are back! BBC America's hit sci-fi series Orphan Black returns for its third season on April 18, with more secrets, more twists, and more Tatiana Maslany. As the world of Sarah Manning and her "sisters" expands, we know it can be difficult to keep track of who's who, so here's a handy guide to get you up to speed.