It’s 1959 and Russia is winning the space race. In order to compete, The United States forms NASA and chooses to recruit the nations best test pilots to form what will become the Mercury Astronauts. Among these test pilots are the golden boy John Glenn, the reckless Alan Shepard, and Gordo Cooper, whose broken marriage could cost him a place at the program.

The press descends upon the domestic lives of the astronauts. Shepard and Gordo wilt under the limelight while Glenn thrives. Glenn secures a deal with Life Magazine that grants exclusive access to all seven astronauts in return for life-altering compensation. By the time the astronauts arrive in Florida to begin work, even Shepard has come to understand the power they now hold.

After mysterious bouts of vertigo, Shepard turns to Dee O’Hara to help him. Meanwhile, Cocoa Beach has transformed from ghost town to perpetual party. Gordo finds himself tempted by another woman. Glenn seeks refuge from the bedlam at a local church gathering, where even he is confronted by temptation. The astronauts’ families arrive in Florida to watch the first test launch of the Atlas Rocket.

After a rocket malfunctions during a test, the Mercury 7 head home for Christmas. Shepard’s holidays are fraught, as the arrival of his parents coincides with the adoption of Louise’s niece. Gordo’s former mistress forces her way back into his life, jeopardizing his relationship with Trudy. And Glenn attempts to win over a rising political star and presidential hopeful, JFK.

JFK sends a science committee to Cape Canaveral to assess the validity of the space program. Glenn, burning from the results of the peer vote, drafts letters to politicians complaining that Shepard is morally unfit to be the first man in space. But matters of internal power plays and a skeptical president are soon dwarfed by news out of Russia that could be the nail in Project Mercury’s coffin.