Our heroes begin to face the reality of their tragic situation. Everyone prepares for a final showdown.
The Flame Will Protect — Tree Adams
Clarke takes The Flame, then explains to Abby that she needs to take chip and enter the City Of Light; Bellamy tells Clarke he believes her and will protect her, then gives her one of ALIE's chips.
Lexa arrives to save Clarke; Lexa and Clarke embrace then run from ALIE's disciples; (repeats) Lexa tells Clarke that she'll always be with her then heads off to hold back ALIE's disciples.
ALIE informs Clarke and Becka that by her calculations in less than 6 months 96% of the Earth's surface uninhabitable, due to the meltdown of damaged nuclear power plants around the world.
Becka tells ALIE to define "perverse instantiation," then explains that how you reach a goal is as important as the goal itself; Bellamy, Abby, Octavia, Pike, Nathan and Bryan fight to protect Clarke.
The clipped awaken as their emotions, pain and memories return; John and Emori are reunited; Abby comforts Kane; Jasper confirms ALIE defeat; Clarke tells Bellamy they didn't save the world.