There is a great war going on in your body all the time. This battle, which began billions of years ago, is still taking place in each of us. This is the story of the invasion of the virus-the life-and-death battle of cells. The film reveals the delicate mechanics of the human cell system from the inner world of the cell: from the fanatical cell membrane that acts as a security against every object in and out of the cell, the cell rack that transports material particles through the cell, and the mitochondria that keep the entire cell world running, to the nucleus that preserves DNA and the synthesis of thousands of different proteins. And the virus is designed to hijack the system for its use: to create more viruses.