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As fall gives way to winter, we all know what that means ... tis the season! And we're not talking holidays -- we're talking flu season. Ever wonder what's going on inside your body when it's under attack? Just how does your body fight back to stop a virus from advancing. Every day, trillions of cells inside your body engage in a life and death struggle with viruses and a variety of enemy intruders . This episode of Curiosity presents that battle in all its surprisingly stunning glory as it explores the once invisible world of the human cell. Based on the latest scientific research -- combined with new imaging and CGI technologies -- we expose this world like never before by revealing a human cell's 48-hour battle to the death with a virus.