In the late 1990s, the world was shocked by the mass suicide of 39 members of a new age religious cult who believed their souls would "graduate" to an alien spacecraft behind the Hale-Bopp Comet. Co-founded by Marshall Applewhite, who once called the group “the cult of cults,” and Bonnie Nettles, Heaven’s Gate began in 1975 with the mysterious disappearance of 20 people from a small town in Oregon - and ended in 1997 with the largest suicide ever to take place on U.S. soil. Using never-before-seen footage and first-person accounts from former members and their loved ones, this four-part docuseries is a thorough examination of the infamous UFO cult that stunned the globe with their out-of-this-world beliefs.

CNN

The Awakening

After forming a small group in Oregon in the 1970s, Heaven's Gate co-founders Bonnie Nettles and Marshall Applewhite hit the road for recruitment meetings, asking members to leave their family and lives behind.

The Chrysalis

Following Ti's death in 1985, Do leads the group into a more extreme belief system in which members will graduate to the "next level" together.

The Second Harvest

With the group's dwindling membership compounded by a failed attempt at recruitment, Do begins to plan their exit to the next level.

The Exit

The arrival of the Hale-Bopp comet spurs the group to prepare for their exit. Today, former members, loved ones, and experts reflect on Heaven's Gate's legacy.