A British street urchin walks along a train platform, trying to gain access to her young daughter, when she sees a young woman commit suicide by leaping in front of a train. The twist? The young woman is an exact double of our young urchin, a perfect match - or as it's soon revealed, a clone. And so begins Orphan Black, one of those little-known, incredibly-well-reviewed shows that never really gets as much recognition as it deserves. Coming off the back of a critically-lauded first season which saw the British urchin - Sarah Manning (Tatiana Maslany) - meet and form an alliance with several of her fellow clones, namely Canadian soccer mom and tightly-wound perfectionist Alison Hendrix and dreadlocked American science PhD student Cosima Niehaus, in order to discover the truth about them and why they were created. The show is a rare blend - fusing a big premise, science-fiction credentials and a big action streak running through it with film noir-esque impersonations as clone imitates her fellow clone, a funny bone that warrants it, and a big heart. Fortunately, Orphan Black was renewed, and rightfully so, for a second season, one that will hopefully garner bigger ratings figures and more mainstream acclaim - and so, here are five reasons why the second season of Orphan Black is very exciting indeed...