Tatiana Maslany in Orphan Black

The BBC America series Orphan Black is a total blast. It's a science fiction series in which a bunch of young woman discover they are clones of one another, and that they are being hunted and eliminated. None of it would work if the lead actress, Tatiana Maslany, who plays all the clones, weren't pretty remarkable. Not only has she developed total physical personalities for each iteration, she is often doing scenes with herself, and sometimes she plays clones pretending to be other clones. There is never a moment when I don't believe in her.