Joe Otterson TV ReporterThe co-showrunners of the “Halo” series at Paramount Plus are exiting the series, Variety has learned exclusively.Steven Kane and Kyle Killen are both out of the long-gestating video game adaptation. According to sources, Killen departed the project ahead of the start of production last year as he felt he was unable to render full-time showrunner duties during the show’s shoot in Budapest.