A team of astronauts put themselves at risk and make sacrifices as they race to become the first humans on Mars.
With the mission in danger of getting canceled, the Vista team travels to Washington to testify before Congress.
Kayla and Tom have a disagreement when faced by a tough decision. The crew's safety is at risk after a problem happens with the Mars Ascent Vehicle.
Sadie and Ollie's marriage faces difficulties. The engineers try to find a solution to the MAV problem.
Denise remembers her troubled upbringing as she paints a portrait of her late mother.
Laz is trying to influence a leading reporter who criticizes the Mars program.
Tom and the crew must speed up before their lives are in danger.
The crew prepares for the big mission while Laz and Denise begin a new chapter in their lives.