With Niska subjected to a battery of tests Laura looks for a way to prove that her client is conscious, while Mattie makes a breakthrough of her own. Athena arrives in the U.K. hoping to learn what Dr. Hobb knows, and Karen returns to work. Meanwhile, Mia decides to confess her secret to Ed.
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.