Snowpiercer adds Clark Gregg to Season 4, plus a new showrunner

The Hollywood Reporter

Paul Zbyszewski becomes the TNT series' third showrunner in four seasons, replacing Orphan Black co-creator Graeme Manson, who replace original showrunner Josh Friedman. According to The Hollywood Reporter, "Manson always planned to remain with the series for three seasons and that the split was amicable." Production on Season 4 is scheduled to begin today.