After Tory's defection, Colonel Saul Tigh (Michael Hogan) admits to his friend and commanding officer that he too is a Cylon in order to prevent what he sees as useless slaughter. Tigh even offers himself up to be airlocked as a bargaining chip. Horrified, Adama orders Tigh to be arrested. As Tigh is escorted away, Adama tears apart his office in a fit of rage and despair. Lee uses Tigh's life, as well as fellow Cylons Samuel Anders (Michael Trucco) and Galen Tyrol (Aaron Douglas), as leverage, but D'Anna refuses, at one point arming the Basestar's nuclear weapons. Gaius Baltar (James Callis), also a hostage, tries to reason with D'Anna.
Kara "Starbuck" Thrace re-inspects the Viper fighter she was piloting in the third season finale "Crossroads" after being requested to by Tigh, Samuel, and Tyrol, and discovers a hidden signal being received by the fighter. She halts the execution of Tigh, and explains to the Galactica's crew that she presumes the signal originates from Earth. Though everyone agrees that it is unlikely, D'Anna and Lee form an alliance to find Earth.
In the final scene of the episode, the Fleet jubilantly arrives at Earth after three years of searching. Adama announces to the Fleet that their journey is finally over. A party of humans and Cylons travels down to the surface, but are speechless when they arrive in the radioactive ruins of a developed city in the middle of a nuclear winter.
Robin Brownfield of SyFy Portal praised the episode overall, but found the trip to Earth to be anti-climactic: "I know the sudden change of venue was necessary to move the story along, but it seemed a bit too rushed..
These ratings do not include viewers who watch the show on DVRs. One source estimated that fewer than 500,000 additional viewers watch Battlestar Galactica on DVR. The Nielsen Ratings estimate for DVR watching (calculated over the seven days following an episode's initial airing) do not count shows watched on delay by fewer than 500,000 viewers, and Battlestar Galactica does not usually appear in the Nielsen DVR ratings.