Riverdale is an American teen drama television series based on the characters of Archie Comics. It follows the lives of Archie Andrews, Betty Cooper, Jughead Jones, and their friends as they uncover the dark secrets of their small town of Riverdale.
The TV show title on the poster probably uses the Colossalis font by Aldo Novarese, a slab serif with narrow widths and flat outer curves. More details about the font can be found here.