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　　Frank Parker works with a special team of scientists and government officials on project Backstep. Using the Backstep device, Lt. Parker can travel back in time exactly 7 days. Once in the past, he reports in to base using code word "Conundrum" and carries out his mission to alter history for the better. Written by Brian Barjenbruch 　　When something utterly catastrophic happens, ... (展开全部)