(S04E11) Note: technically the Razor television movie counts as the first two episodes of the season, so this is actually episode 13. And what an episode it was! It answered the biggest question from the viewers and in the process created a few more.

FYI, the episode title is taken from the folk song "Goodnight, Irene", which pretty much fits the theme of the episode.

I really liked Mary McDonnell's acting in this episode. I felt heartbroken at her breakdown upon discovering the remains of Earth and her inability to share the information with the fleet. Whenever things get bad, at least we're not on the run from homicidal machines with our last great hope for sanctuary a radioactive wasteland.

On to the spoilery bits!