Bill travels back in time, resets the timeline by killing Emily, and is arrested for murder in the "new" reality. Season 2 – War of the Worlds - Rotten Tomatoes
It is revealed that the invaders are not from another galaxy but are the descendants of Emily and Sacha , who traveled back from a distant future to harvest healthy organs and fix their genetic defects.
Catherine finds Bill in London; Bill explains his plan to infect the alien race. War of the Worlds - Season 2
The season begins six months after the initial attack. The survivors in London have formed a resistance, while the "aliens" are revealed to be humanoid in appearance.
Neuroscientist Bill Ward (Gabriel Byrne) develops a virus to target the invaders. He tests it on Emily Gresham (Daisy Edgar-Jones), discovering it is effective because she shares genetic material with them. Bill travels back in time, resets the timeline
Catherine discovers the method of alien travel (space and time) via computer algorithms.
Resistance forms in London; Emily returns from the alien ship with strange visions. The season begins six months after the initial attack
French survivors Catherine, Nathan, and Sophia attempt to reach London.