Harry comes face to face with his greatest enemy and makes a choice that may affect Earth forever.

In an attempt to gather information on the Grey Aliens, Harry puts Asta in harm's way.

D'Arcy inserts herself into Harry's mission, while Kate grows more uncomfortable in her own home.

Harry gets distracted from his mission, while Mike and Liv make a huge discovery.

Harry and Asta team up with an unlikely ally to try to save the Earth.