Rachel tells Aaron that the global power outage was caused by quadrillions of microscopic programmable nanites that execute only two commands: absorb power and replicate. Although Rachel does not know how the nanites went out of control, she tells Aaron that the nanites could be shut off from the Tower, which is in Colorado. Neville faces danger and hard choices as Randall doubts his competence, Monroe doubts his loyalty, he and Julia have to pretend that Jason was killed, and his convoy is ambushed by the rebels led by Miles, resulting in his capture and torture. Charlie stops Rachel from murdering Neville in revenge for Danny's death. Left alone, Rachel and Miles then discuss Charlie and renew their romantic attraction. After mistakenly revealing his destination to Jason, who pretended to free him, Neville kills two rebels and escapes. He then makes his way to Philadelphia and flees with Julia before Monroe learns of his blunder. Using Neville's information, the rebels find that Randall has built a nuclear weapon, which Randall takes back to Philadelphia by car using the pendants. Rachel and Charlie begin slowly patching their relationship, only to be pulled apart again as Rachel embarks on a quest to make amends for her past actions and restore the power, taking Aaron with her on a "suicide mission" to the Tower.
There are no flashbacks.
Should not be confused with the Led Zeppelin song (even if the episode title is named after it). Should not be confused with the Supernatural episode "The Song Remains The Same". Should not be confused with the trope The Song Remains the Same. Should not be confused with the Rockumentary The Song Remains the Same.
Tropes (See Your Mileage May Vary items here):
- Even Evil Has Loved Ones: Tom Neville proves that he truly loves his wife by going back to Philadelphia after failing a mission to get her to flee the Monroe Republic with him. This is when it would have been easier and less risky for him to just leave her twisting in the wind.
- The Reveal: Rachel Matheson reveals to Aaron Pittman that the blackout has been caused by quadrillions of microscopic programmable nanites that execute only two commands: absorb power and replicate.
- You Have Failed Me: Defied Trope. When Tom Neville realizes that Sebastian Monroe will execute him for failing his mission, he gets back to Philadelphia to get his wife to flee the Monroe Republic with him.