Patrick J. Adams John Glenn Actor Aaron Staton Wally Schirra Actor Colin O'Donoghue Gordon Cooper Actor Danny Strong John "Shorty" Powers Actor Eloise Mumford Trudy Cooper Actor Eric Ladin Chris Kraft Actor Jake McDorman Alan Shepard Actor James Lafferty Scott Carpenter Actor Josh Cooke Loudon Wainwright Jr. Actor Micah Stock Deke Slayton Actor Michael Trotter Gus Grissom Actor Nora Zehetner Annie Glenn Actor Patrick Fischler Bob Gilruth Actor Shannon Lucio Louise Shepard Actor Leonardo DiCaprio Executive Producer Jennifer Davisson Killoran Executive Producer Mark Lafferty Executive Producer