Don't forget to say it back.

Rocketing into the new millennium in the eight years since Season 3, Happy Valley has rapidly expanded its footprint on Mars by turning former foes into partners. Now 2003, the focus of the space program has turned to the capture and mining of extremely valuable, mineral-rich asteroids that could change the future of both Earth and Mars. But simmering tensions between the residents of the now-sprawling international base threaten to undo everything they are working towards.

The ensemble cast returning for Season 4 includes Joel Kinnaman, Wrenn Schmidt, Krys Marshall, Edi Gathegi, Cynthy Wu and Coral Peña along with new series regulars Toby Kebbell, Tyner Rushing, Daniel Stern and Svetlana Efremova.

“For All Mankind” is created by Emmy Award winner Moore, and Emmy nominees Nedivi and Wolpert. Nedivi and Wolpert serve as showrunners and executive produce alongside Moore and Maril Davis of Tall Ship Productions, as well as David Weddle, Bradley Thompson and Seth Edelstein. “For All Mankind” is produced by Sony Pictures Television.