: Tensions reach a breaking point between the 12 Grounder clans and the 13th clan ( Skaikru ). Lexa chooses peace over vengeance by ordering a blockade instead of an all-out attack on Arkadia, a decision that ultimately weakens her position in the eyes of her people. The 100: Thirteen Review | Den of Geek
: The episode confirms that the "spirit of the Commander" passed down through generations is actually the ALIE 2.0 AI chip. Titus removes the chip from the back of Lexa's neck immediately after her death. Watch The 100 S03E07 1
: Flashbacks to 97 years prior reveal that a scientist named Becca created ALIE 2.0 , an AI designed to interface biologically with humans to ensure survival. After Earth was destroyed by ALIE 1.0, Becca fled to the ground from the 13th space station, Polaris , becoming the first Commander. : Tensions reach a breaking point between the