For video release in the mid-1980s, an additional episode of this series was created, consisting of a one-on-one interview between Carl Sagan and media mogul Ted Turner, discussing the themes of the series.
Reissues of the series feature different music than on the original broadcast, due to licensing issues.
For the German version, all episodes were cut down to ca. 43 minutes to fit into the programming schedule of public broadcaster ZDF.
In 1991, Sagan taped new introductions and afterwords to mark the show's 10th anniversary. These new segments allowed him to update and correct information presented in the series.