Creator and showrunner from NOS4A2 Jami O'Brien (Fear The Walking Dead) announced the news on Twitter. Next to that, his tweet also thanked the other cast members, fans and Joe Hill, the author of the book with the same name upon which the series is based. In NOS4A2, the young Victoria 'Vic' McQueen (Ashleigh Cummings, Westside) discovers that she can unlock portals. When Vic meets Charlie Manx, they become sworn enemies. The second season takes place eight years after the ending of the first season.
Well friends, I heard from AMC last week. We won’t be making a 3rd season of #NOS4A2 . It’s a bummer, but I’m grateful we were at least able to finish adapting the storyline from Joe Hill’s terrific novel... 1/4
— Jami O'Brien (x-on:jami_obrien) August 31, 2020