: Despite the surrounding chaos, the survivors take a moment to celebrate Tom’s birthday, though the peace is short-lived as the alien threat looms. Main Cast & Characters

: 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".

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