Chris Agos as Buzz Aldrin Matt Battaglia as John Glenn Chris Bauer as Deke Slayton Jeff Branson as Neil Armstrong Dan Donohue as Thomas O. Paine Colm Feore as Wernher von Braun Ryan Kennedy as Michael Collins Eric Ladin as Gene Kranz Steven Pritchard as Pete Conrad Rebecca Wisocky as Marge Slayton Ben Begley as Charlie Duke Frank Borman as himself (stock footage) Jim Lovell as himself (stock footage) Alan Shepard as himself (stock footage, also referred to in Episode 1) Gus Grissom as himself (stock footage, also referred to in various episodes) Scott Carpenter as himself (stock footage) Gordo Cooper as himself (stock footage) Wally Schirra as himself (stock footage)