Heaven's Gate: The Cult of Cults: Season 1, Episode 3

1 - 3: The Second Harvest

Using a popular sci-fi TV series to help bolster his teachings, Do encourages asexuality and individual submission for the benefit of the collective - and even initiates voluntary castrations. The group starts recruiting again, having dwindled in number, but they're met largely with derision and skepticism. Seeing this as a sign, Do begins planning their exit to the next level.