Spudvisor
David Clennon

Lee Silver (12 episodes)

Dr. Lee Silver (2 episodes)

Nick Searcy
Lane Smith

Emmett Seaborn (6 episodes)

Tim Daly
Cary Elwes

Michael Collins (3 episodes)

Rita Wilson
Conor O'Farrell
Ben Marley

Roger Chaffee (3 episodes)

Tom Verica
Tom Amandes
Dann Florek

Robert Seamans (2 episodes)

Norbert Weisser

Wernher Von Braun (2 episodes)

Sam Anderson
Ann Cusack

Jan Armstrong (2 episodes)

Tony Goldwyn

Neil Armstrong (2 episodes)

Ted Levine

Alan Shepard (2 episodes)

Fredric Lehne

Walt Cunningham (2 episodes)

John Mese

Donn Eisele (2 episodes)

Kieran Mulroney

Rusty Schweickart (2 episodes)

John Slattery

Walter Mondale (1 episode)

Mason Adams

Clinton Anderson (1 episode)

Mark Harmon

Wally Schirra (1 episode)

Steve Zahn
James Rebhorn

Harrison Storms (1 episode)

Rhoda Griffis

Martha Chaffee (1 episode)

Ronny Cox
Dan Bright

Mondale's Assistant (1 episode)

Bill Cordell

pyro technician (1 episode)

J. Don Ferguson

Senator Stephen Young (1 episode)

Ru Flynn

Storms' Secretary (1 episode)

Don Fowler

Harrison Storms Jr. (1 episode)

David Lenthall

Sam Benningfield (1 episode)

Dakin Matthews

Dr. Floyd Thompson (1 episode)

Robby Preddy

Phyllis Storms (1 episode)

Joe Spano

George Mueller (1 episode)

Arthur Taxier

Dr. Robert Van Dolah (1 episode)

Peter Horton

documentary director (1 episode)

Max Wright

GĂĽnter Wendt (1 episode)

Keith Graham
Lowell Fenner

Russ Lawrence (1 episode)

Mark Lainer

Doubting Engineer (1 episode)

Reed Birney

John Houbolt (1 episode)

David Brisbin

Allyn B. Hazard (1 episode)

Betsy Brantley
Jim Leavy

C.C. Williams (1 episode)

Jay Mohr

Brett Hutchins (1 episode)

David Kaufman
Michael Laskin

Larry Thompson (1 episode)

Ethan Phillips
John Rothman

Warren Moburg (1 episode)

Dylan Baker
Gary Cole

Ed Mitchell (1 episode)

Andrew Rubin

Jules Bergman (1 episode)

John Aylward

Dr. Ray Pemberton (1 episode)

Isa Totah

Farouk El-Baz (1 episode)

Wendy Crewson

Faye Stafford (1 episode)

J. Downing

Charlie Duke (1 episode)

John Michael Higgins

Master of Ceremonies (1 episode)

Zeljko Ivanek

Ken Mattingly (1 episode)

Robert C. Treveiler
Al Franken

Jerome Weisner (1 episode)

Jack Gilpin

Ted Sorenson (1 episode)

Aaron A. Akins Jr.

Construction Coordinator (12 episodes)

Kitty Doris-Bates

Supervising Art Director (12 episodes)

Michele Poulik
Richard Toyon

Production Design (12 episodes)

Seth Reed

Art Direction (12 episodes)

Gale Tattersall

Director of Photography (12 episodes)

Debi Young

Assistant Makeup Artist (2 episodes)

Terry Odem

Associate Producer (12 episodes)

Bridget Potter

Consulting Producer (12 episodes)

Tony To

Co-Executive Producer (12 episodes)

John Melfi

Supervising Producer (12 episodes)

Mark Isham

Original Music Composer (2 episodes)