You can get season one of When We Left Earth: The NASA Missions, from The Discovery Channel, for free right now. You must FIRST enter the promotion code BLASTOFF, so that you'll get the $11.94 credit to your account, before purchasing the season. To do this, click where it says Redeem a gift card or promotion code & view balance, directly beneath the viewing window. Enter the promotion code and wait to see a confirmation that the $11.94 has been credited to your account. Then, click on the button that says Buy Season 1 with 1-Click $11.94. You'll get a confirmation email that shows the purchase and the credit, with a net zero billing.
Season Synopsis
Discovery Channel presents the dramatic story of NASA's pioneering, awe-inspiring missions commemorating the first 50 years of space exploration in the landmark special series When We Left Earth: The NASA Missions. Featured is never-before-seen footage from NASA's secret film vaults, digitally remastered into stunning quality.