Thirteen | [s3e7]

: Becca, an elite scientist, created A.L.I.E. 1.0, which subsequently triggered the nuclear apocalypse to "solve" overpopulation.

: To prevent the AI from "infecting" the other 12 stations (which became the Ark), the Ark commanders ordered Polaris destroyed.

" Thirteen " is a pivotal episode of The 100 that bridge's the series' Grounder mythology with its hard science-fiction origins. It is widely regarded as the most controversial hour in the show's history due to the death of a major character. Executive Summary [S3E7] Thirteen

: Becca worked on a second, more "human" AI version on the station Polaris.

: Commander Lexa is killed by an accidental gunshot, sparking massive fan backlash and a national conversation on the "Bury Your Queers" trope. Key Plot Developments 1. The Past: Polaris and the First Commander : Becca, an elite scientist, created A

: The episode parallelizes two "13th" entities: the 13th Grounder Clan ( Skaikru ) and the 13th space station ( Polaris ).

: Explains the end of the world via Becca's rogue AI, A.L.I.E. 1.0, and the birth of the Commander's lineage through A.L.I.E. 2.0. " Thirteen " is a pivotal episode of

: Becca injected herself with "Nightblood" (a radiation filter) and escaped to Earth with A.L.I.E. 2.0, becoming the first Commander.