David Clennon
Dr. Lee Silver (14 eps)
Tom Hanks
Host (13 eps)
Stephen Root
Chris Kraft (5 eps)
Steve Hofvendahl
Tom Stafford (4 eps)
Holmes Osborne
George Low (3 eps)
Rita Wilson
Susan Borman (3 eps)
John Posey
John Young (3 eps)
Conor O'Farrell
James McDivitt (3 eps)
Ben Marley
Roger Chaffee (3 eps)
Tom Verica
Dick Gordon (3 eps)
Dann Florek
Robert Seamans (2 eps)
Norbert Weisser
Wernher Von Braun (2 eps)
Sam Anderson
Thomas Paine (2 eps)
Clint Howard
Paul Lucas (2 eps)
Dan Butler
Gene Kranz (2 eps)
George Newbern
Stu Roosa (2 eps)
Jo Anderson
Pat White (2 eps)
Ann Cusack
Jan Armstrong (2 eps)
Tim Parati
Blaisdell (2 eps)
Dan Lauria
James Webb (2 eps)
Mark Rolston
Gus Grissom (2 eps)
Chris Isaak
Ed White (2 eps)
John Carroll Lynch
Bob Gilruth (2 eps)
Tony Goldwyn
Neil Armstrong (2 eps)
Ted Levine
Alan Shepard (2 eps)
Fredric Lehne
Walt Cunningham (2 eps)
John Mese
Donn Eisele (2 eps)
Robert John Burke
Bill Anders (2 eps)
Kieran Mulroney
Rusty Schweickart (2 eps)
Bryan Cranston
Buzz Aldrin (2 eps)
Tchéky Karyo
George Melies (1 eps)
Steve Zahn
Elliot See (1 eps)
Peter Scolari
Pete Conrad (1 eps)
Kevin Pollak
Joe Shea (1 eps)
James Rebhorn
Harrison Storms (1 eps)
Rhoda Griffis
Martha Chaffee (1 eps)
Ronny Cox
Lee Atwood (1 eps)
Dan Bright
Mondale's Assistant (1 eps)
Tommy Canary
Simpkinson (1 eps)
Bill Cordell
pyro technician (1 eps)
J. Michael Hunter
Skip Chauvin (1 eps)
J. Don Ferguson
Senator Stephen Young (1 eps)
Ru Flynn
Storms' Secretary (1 eps)
Don Fowler
Harrison Storms Jr. (1 eps)
Tom Kouchalakos
technician (1 eps)
Mitchell Laurance
Bud Mahurin (1 eps)
David Lenthall
Sam Benningfield (1 eps)
Dakin Matthews
Dr. Floyd Thompson (1 eps)
Robby Preddy
Phyllis Storms (1 eps)
Kevin Rainsberger
Dr. Berry (1 eps)
Frank Silva
Levine (1 eps)
Joe Spano
George Mueller (1 eps)
Arthur Taxier
Dr. Robert Van Dolah (1 eps)
Peter Horton
documentary director (1 eps)
Max Wright
Günter Wendt (1 eps)
Krista Adair
Jo Schirra (1 eps)
Ann Magnuson
Dee O'Hara (1 eps)
Keith Graham
Skip Chauvin (1 eps)
Brandon Smith
John Healey (1 eps)
Joshua Malina
Tim Messick (1 eps)
Lowell Fenner
Russ Lawrence (1 eps)
Philip Nolen
bonehead (1 eps)
Matt Craven
Tom Kelly (1 eps)
Alan Ruck
Tom Dolan (1 eps)
Mark Lainer
Doubting Engineer (1 eps)
Grant Shaud
Bob Carbee (1 eps)
Reed Birney
John Houbolt (1 eps)
David Brisbin
Allyn B. Hazard (1 eps)
Daniel Hagen
Honeycutt (1 eps)
Diana Scarwid
Joan Aldrin (1 eps)
Betsy Brantley
Jan Armstrong (1 eps)
Dave Foley
Alan Bean (1 eps)
Paul McCrane
Pete Conrad (1 eps)
Jim Leavy
C.C. Williams (1 eps)
Geoffrey Nauffts
Ed Gibson (1 eps)
Jay Mohr
Brett Hutchins (1 eps)
John M. Jackson
Hal Deacon (1 eps)
David Kaufman
David Gibson (1 eps)
Michael Laskin
Larry Thompson (1 eps)
Ethan Phillips
Stanley Craig (1 eps)
John Rothman
Warren Moburg (1 eps)
Dylan Baker
Bruce McCoy (1 eps)
Adam Baldwin
Fred Haise (1 eps)
Gary Cole
Ed Mitchell (1 eps)
Jerry Hardin
Ben Taylor (1 eps)
Chris Hogan
Don Eyles (1 eps)
Andrew Masset
Dr. House (1 eps)
Harve Presnell
Harve (1 eps)
Andrew Rubin
Jules Bergman (1 eps)
John Aylward
Dr. Ray Pemberton (1 eps)
Michael Raynor
Al Worden (1 eps)
Isa Totah
Farouk El-Baz (1 eps)
Gareth Williams
Jim Irwin (1 eps)
Doug McKeon
Joe Allen (1 eps)
Sally Field
Trudy Cooper (1 eps)
Elizabeth Perkins
Marilyn Lovell (1 eps)
JoBeth Williams
Marge Slayton (1 eps)
Wendy Crewson
Faye Stafford (1 eps)
J. Downing
Charlie Duke (1 eps)
R. Keith Harris
Charlie (1 eps)
John Michael Higgins
Master of Ceremonies (1 eps)
Zeljko Ivanek
Ken Mattingly (1 eps)
Delane Matthews
Pat McDivitt (1 eps)
Deirdre O'Connell
Barbara Young (1 eps)
Debra Jo Rupp
Marilyn See (1 eps)
Cynthia Stevenson
Jane Conrad (1 eps)
Robert C. Treveiler
L. Gordon Cooper (1 eps)
Blythe Danner
narrator (1 eps)
Elizabeth Morehead
Tracy Cernan (1 eps)
Bart Braverman
Older Sahjid (1 eps)
George Kapetan
Ed Frendel (1 eps)
Chris Ellis
Bob Parker (1 eps)
Al Franken
Jerome Weisner (1 eps)
Jack Gilpin
Ted Sorenson (1 eps)
George Bartenieff
Hugh Dryden (1 eps)
Tom Nowicki
David Bell (1 eps)
Jim Piddock
John Hodge (1 eps)
