The Vow viewers were left sickened at gruesome scenes which saw the leader of the NXIVM sex cult's initials branded into women's skin.
The HBO documentary series follows the story of the NXIVM group, which made headlines last year when some of its famous members faced charges of sex trafficking, racketeering and forced labour.
NXIVM was also accused of keeping sex slaves and branding its members with leader Keith Raniere's initials, which was explored in last night's episode.
Raniere was found guilty of racketeering, sex trafficking, forced labour conspiracy and wire fraud conspiracy earlier this year.
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