A brief look at a quirky film from the award-winning documentary maker.
We'll bet you don't know everything about our favourite film-maker...
Louis meets transgender children as they undergo life changing treatment.
Louis Theroux traces the fortunes of different people suffering from alcoholism.
Louis Theroux meets people living with the long-term effects of a brain injury.
Louis visits Coalinga Mental Hospital, which houses more than 500 convicted paedophiles.