: 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.
: The episode parallelizes two "13th" entities: the 13th Grounder Clan ( Skaikru ) and the 13th space station ( Polaris ). [S3E7] Thirteen
: 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 : Explains the end of the world via Becca's rogue AI, A
: Becca worked on a second, more "human" AI version on the station Polaris. : The episode parallelizes two "13th" entities: the
: 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.
: Becca injected herself with "Nightblood" (a radiation filter) and escaped to Earth with A.L.I.E. 2.0, becoming the first Commander.