Patrick J. Adams as John Glenn
Jake McDorman as Alan Shepard
Colin O'Donoghue as Gordon Cooper
Eloise Mumford as Trudy Cooper
James Lafferty as Scott Carpenter
Nora Zehetner as Annie Glenn
Eric Ladin as Chris Kraft
Patrick Fischler as Bob Gilruth
Aaron Staton as Wally Schirra
Michael Trotter as Gus Grissom
Micah Stock as Deke Slayton
Shannon Lucio as Louise Shepard
Jackson Pace as Glynn Lunney
Josh Cooke as Loudon Wainwright
Kaley Ronayne as Dee O'Hara