Twenty years ago, Roberto Aguirre-Sacasa received a cease-and-desist letter from Archie Comics after he wrote a play in which Archie came out as gay and met up with the murderers Leopold and Loeb. Now he’s Archie Comics’ chief creative officer and the showrunner of the franchise’s two TV series — and Riverdale is far less all-white-and-all-straight than ever before. Alexis Soloski travels to the Vancouver sets of the TV series to watch Aguirre-Sacasa at work.