The series features interviews with X-1 and X-15 pilots Chuck Yeager, Scott Crossfield and Pete Knight, astronauts Gordon Cooper, Wally Schirra, Scott Carpenter, Gene Cernan, Frank Borman, James Lovell, Buzz Aldrin and Alan Bean, flight controllers Gene Kranz, Christopher Kraft, John Hodge and Sy Liebergot, engineers Günter Wendt, Max Faget, John Houbolt, Bob Gore, Robert Sieck and Richard Dunne, authors Arthur C. Clarke, Andrew Chaikin, Robert Godwin, Spider Robinson and Robert J. Sawyer, historians Paul Fjeld and Professor John Lienhart, Dr Raymond Puffer and Dr James Young, Manhattan Project physicist Hans Bethe, head of the Lovelace Clinic Dr. Donald E. Kilgore, Dr David Simons of Holloman AFB, Colonel Joe Kittinger, and broadcaster Walter Cronkite, among others.
The series was produced, written and directed by Canadian filmmaker Michael Lennick for The Discovery Channel (Canada), and narrated by actor Graham Greene.
Lennick filmed a pilot episode named "The Highest Step" about the high-altitude balloon flights of Project Manhigh and the rocket sled tests of Colonel John Paul Stapp.
In 2003 director Michael Lennick's production company, Foolish Earthling, released the pilot episode on DVD.
The rest of the series was released in 2004 in DVD-video format as a three-disc box set with total running time of 540 minutes.