: Bill intervenes to help Isla, the young alien held hostage by the military group, allowing her to escape and return to her people.

: Catherine focuses on computer algorithms left by Dylan, a survivor who was found dead. She makes a startling discovery regarding how the aliens traveled to Earth and begins to decipher the behavior of their robotic quadruped "dogs".

: Bill continues his research into a biological weapon, using Emily as a test subject. He makes a request that inadvertently puts Zoe in danger while trying to protect his findings.

: The news that Sacha killed Ash finally comes to light. This revelation causes a major rift in the group, leading Emily and her family to separate from Sacha.

: Following the fallout, Sacha’s behavior becomes increasingly erratic and disturbing as he secretly follows the group to stay near Emily.