Actor Clark Gregg, well-known for starring as Agent Coulson in the Marvel Cinematic Universe, has joined the cast of the upcoming season 4 of Snowpiercer. The news comes just ahead of the premiere of the season 3 finale.

Along with Gregg, The Americans-actor Michael Aronov has also joined the cast. The series is headlined by Daveed Diggs and Jennifer Connelly.

Season 4 of Snowpiercer started production earlier this week with a new showrunner, Paul Zbyszewski, helming the series replacing Graeme Manson.

Snowpiercer is set over seven years after Earth has become a frozen wasteland and follows the survivors who board a train called Snowpiercer that never stops anywhere.

Season four will be executive produced by Zbyszewski, Christoph Schrewe, Marty Adelstein, Becky Clements, Matthew O’Connor, Ben Rosenblatt and Scott Derrickson. The film’s original producers, Bong Joon Ho, Miky Lee, Jinnie Choi, Park Chan-wook, Lee Tae-hun and Dooho Choi, will also executive produce.

Meanwhile, the final episode of Season 3 will air tonight (Tuesday) on TNT at 9 PM EST.