Denise Petski Senior Managing EditorEXCLUSIVE: Nathan Stewart-Jarrett (Misfits) is set as a series regular on HBO Max’s Lena Dunham-produced half-hour dramedy, Generation.Created by Zelda Barnz and her father Daniel Barnz, who also directs, Generation is a dark yet playful half-hour following a group of high school students whose exploration of modern sexuality (devices and all) tests deeply entrenched beliefs about life, love and the nature of family in their conservative