All ten episodes from the third series of the Canadian/US sci-fi drama starring Tatiana Maslany as identical women who are revealed to be clones. In this series, Sarah (Maslany) tries to track down her missing twin, Helena (also Maslany), with the Castor clones in hot pursuit of the Leda sisters. Meanwhile, the Proletheans continue their pursuit of all clones and Sarah tries to find out more about the origins of Project Castor. The episodes are: 'The Weight of This Combination', 'Transitory Sacrifices of Crisis', 'Formalized, Complex and Costly', 'Newer Elements of Our Defence', 'Scarred By Many Past Frustrations', 'Certain Agony of the Battlefield', 'Community of Dreadful Fear and Hate', 'Ruthless in Purpose and Insidious in Method', 'Insolvent Phantom of Tomorrow' and 'History Yet to Be Written'.