The first anniversary of the day the aliens were defeated, Liberation Day, could lead to Earth's last day: alien commander Diana escapes in a fatal attempt by Nathan Bates to exploit her for the aliens secrets and reunites with her fleet. After discovering the Red Dust bacterium is beginning to fail Diana orders the Fleet back to Earth for a final assault . Elizabeth, the Starchild, undergoes a strange metamorphosis to the surprise of Julie and Robert. When the Visitors begin their attack on Los Angeles Elias' restaurant becomes the new resistance headquarters. Nathan Bates is visited by Diana at Science Frontiers. Nathan informs Julie that they can no longer use the Red Dust bacterium against the Visitors.