A crew of astronauts battles peril and personal sacrifice as they race to become the first humans on Mars.

Sadie and Ollie's marriage is tested. Laz works with the engineers as pressure builds to find a solution to the MAV malfunction. Tom and Ellen grow closer.

Denise confronts her turbulent upbringing as she paints a portrait of her late mother, revisiting a lifetime of joy and trauma.

Laz attempts to sway an influential reporter who is critical of the Mars program. Aiko and Eitan test a solution to the MAV problem. An incident with Denise forces Tom to reconsider his priorities.

Tom and the Providence crew must make a choice with potentially life-threatening consequences. Matteo wrestles with his past. Tom and Denise must deal with unfinished business.

The members of Providence 2 gear up for their mission on launch day. Laz and Denise must prepare for a new chapter in their lives.