Thirteen - [s3e7]

: 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

: To prevent the AI from "infecting" the other 12 stations (which became the Ark), the Ark commanders ordered Polaris destroyed. [S3E7] Thirteen

: 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. : Commander Lexa is killed by an accidental