: Bill understands that humanity's survival depends on a drastic action. He uses a time-travel formula to go back to the past and kill Emily before she can meet Sacha, effectively erasing the invasion timeline and all the deaths associated with it.

: Catherine deciphers algorithms that explain alien behavior and how they traveled to Earth. Bill helps Isla escape, while Emily (Daisy Edgar-Jones) agrees to test a virus meant to wipe out the invaders.

The second season of this sci-fi reimagining follows survivors in London and France as they discover the shocking truth: the "aliens" are actually of Emily and Sacha. These descendants traveled back in time to harvest healthy organs to fix their own genetic defects. Episode Summaries (5–8)