Season 0 of Secrets of the Dead premiered on December 26, 2017.

Season 1 of Secrets of the Dead premiered on May 14, 2000.

The first season of the PBS "Secrets of the Dead" are versions of the UK (Channel 4) documentary series of the same name. The episodes in this season were reworked (re-edited, re-branded, and re-narrated by Roy Scheider) from the UK episodes. The episodes were originally available on VHS as a season set and individually.

Season 2 of Secrets of the Dead premiered on June 26, 2001.

These six episodes of this PBS documentary series are adapted from the UK series of the same name, but are re-edited, re-branded, and re-narrated by Liev Schreiber.

Season 3 of Secrets of the Dead premiered on May 8, 2001.

Season 4 of Secrets of the Dead premiered on November 1, 2003.

Season 5 of Secrets of the Dead premiered on October 19, 2005.

Season 6 of Secrets of the Dead premiered on November 8, 2006.

Season 7 of Secrets of the Dead premiered on April 23, 2008.

Season 8 of Secrets of the Dead premiered on May 7, 2008.

Season 9 of Secrets of the Dead premiered on May 13, 2009.

Season 10 of Secrets of the Dead premiered on November 3, 2010.

Season 11 of Secrets of the Dead premiered on April 20, 2011.

Season 12 of Secrets of the Dead premiered on October 23, 2012.

Season 13 of Secrets of the Dead premiered on November 13, 2013.

Season 14 of Secrets of the Dead premiered on January 28, 2015.

Season 15 of Secrets of the Dead premiered on October 27, 2015.

Season 16 of Secrets of the Dead premiered on October 26, 2016.

Season 17 of Secrets of the Dead premiered on January 24, 2018.

Season 18 of Secrets of the Dead premiered on July 2, 2019.

Season 19 of Secrets of the Dead premiered on October 20, 2021.

Season 20 of Secrets of the Dead premiered on October 9, 2022.

Season 21 of Secrets of the Dead premiered on October 25, 2023.