“The Act” is a character-based true-crime anthology series from writers Nick Antosca (“Channel Zero”) and Michelle Dean that tells startling, stranger-than-fiction true crime stories. The first season is based on Dean’s 2016 Buzzfeed article “Dee Dee Wanted Her Daughter To Be Sick, Gypsy Wanted Her Mom To Be Murdered.” It follows Gypsy Blanchard, a girl trying to escape the toxic relationship she has with her overprotective mother. Her quest for independence opens a Pandora’s box of secrets, one that ultimately leads to murder. Antosca and Dean along with Greg Shephard and Britton Rizzio will executive produce. UCP, where Antosca is under an overall deal, is the studio.