A deadly patchwork of destructive cyclones is on an apocalyptic path of convergence at a populated Midwest city center. There, the twisters will merge into one mega tornado that threatens to obliterate the cities for hundreds of miles around.

An alien spacecraft lands near New York and destroys everything as it heads toward Washington D.C. If it reaches the capital, it will trigger an invasion. Scientists and the military must stop it before it's too late.