In the third season, an artificial intelligence named A.L.I.E. is revealed to be responsible for the nuclear apocalypse that devastated Earth 97 years before the series, and she has a secret agenda of her own. Camp Jaha, now renamed Arkadia, comes under new management when Pike, a former teacher and mentor, was elected over Kane as Chancellor and begins a war with the grounders.
In the third season, an artificial intelligence named A.L.I.E. is revealed to be responsible for the nuclear apocalypse that devastated Earth 97 years before the series, and she has a secret agenda of her own. Camp Jaha, now renamed Arkadia, comes under new management when Pike, a former teacher and mentor, was elected over Kane as Chancellor and begins a war with the grounders.