A Will of Their Own - EW.com

''The world is all that is encased here; life, death, people, the allies, and everything else that surrounds us. The world is incomprehensible. We won't ever understand it; we won't ever unravel its secrets. Thus we must treat it as it is, a sheer mystery!'' — Carlos Castaneda

We are mysteries unto ourselves. Are killers born or made? Are we born evil or do we become evil? Are we products of nature or nurture? ''He's Our You,'' the tenth episode of Lost's rapidly dwindling fifth season, was a brain-melting thriller filled with deep, dark thoughts, with none bigger than this: Has Sayid changed Lost history by popping a cap in Young Ben in the Dharma Initiative past? It's the old ''If you could go back and kill Hitler, would you and could you?'' conceit, and the show winked at it when Sayid dropped the ''genocide'' bomb in describing his former employer's wickedness. However, I'm guessing that Sayid — new and improved with drug-induced pseudo-enlightenment — didn't succeed in realizing his new life's purpose, at least not yet. Shooting Ben didn't immediately cause reality to blink away, so we are left to wonder: Did the paradox-averse Overmind which regulates the course of events on the Island direct Sayid's bullet to avoid Ben's major organs? (Yo, Double-O Jarrah: Aim for the freakin' head!) Or is Young Ben simply not dead yet? You know where this is going. Next episode: ''Paging Dr. Shephard! Paging Dr. Shephard! Yet another life-saving/cosmos-preserving surgery on your arch-nemesis is waiting for you in Operating Room 306!''

More:  'Lost' recap: A will of their own | Lost | 1 | TV Recaps | EW.com