Michael Harney as Jack Broadstreet Tait Blum as Shane Baldwin (son of Ed and Karen Baldwin) Arturo Del Puerto as Octavio Rosales (an undocumented Mexican immigrant who settles in Houston with his daughter Aleida and gets a job as a custodian at the Johnson Space Center) Noah Harpster as Bill Strausser (a Mission Controller) Krys Marshall as Danielle Poole (an African American female astronaut) Edwin Hodge as Clayton Poole (Danielle's husband) Tracy Mulholland as Gloria Sedgewick (wife of Frank Sedgewick) Dave Power as Astronaut Frank Sedgewick (Command Module Pilot of Apollo 15) Mason Thames as Danny Stevens (older son of Gordo and Tracy Stevens) Olivia Trujillo as Aleida Rosales Sonya Walger as Molly Cobb (one of the Mercury 13 and the first American female astronaut to the Moon; the series producers selected the character's surname as "Cobb" to honor the real Mercury 13's Geraldyn M. Cobb who had died during the production of the first season of the series[4]) Meghan Leathers as Pam Horton (a barkeeper, and Ellen's lover) Wallace Langham as Harold Weisner, (NASA administrator in the Ted Kennedy administration; he replaced Thomas Paine as head of NASA) Nate Corddry as Larry Wilson (a gay NASA engineer who poses as Ellen's boyfriend and later husband) Leonora Pitts as Irene Hendricks (first woman Flight Director, replaced Gene Kranz on the White Team) Dan Warner as General Arthur Weber, USAF (military liaison to NASA) Lenny Jacobson as Wayne Cobb, Molly's pot smoking artist husband Mark Ivanir as Mikhail Mikhailovich Vasiliev, Soviet cosmonaut