He's made a name for himself as one of the world's most popular documentary makers, and he's back with a new three part series.
The BBC has announced that Louis Theroux will be back on our screens with a series called 'Altered States.'
Birth, sex, death, adoptions, polyamorous relationships and euthanasia are themes that will be addressed by Theroux.
The series was filmed in America, and Theroux says it's access all areas:
"I have been given extraordinary levels of access to courageous people and families across the United States, many of them enduring unbelievable levels of stress and anguish, and it was a privilege to be allowed into their lives in this most personal way."