" 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
: Becca injected herself with "Nightblood" (a radiation filter) and escaped to Earth with A.L.I.E. 2.0, becoming the first Commander. [S3E7] Thirteen
: The episode parallelizes two "13th" entities: the 13th Grounder Clan ( Skaikru ) and the 13th space station ( Polaris ). " Thirteen " is a pivotal episode of
: Becca, an elite scientist, created A.L.I.E. 1.0, which subsequently triggered the nuclear apocalypse to "solve" overpopulation. an elite scientist