Louis Theroux's Weird Weekends is a television documentary series, in which Louis Theroux gives viewers the chance to get brief glimpses into the worlds of individuals and groups that they would not normally come into contact with or experience up close. In most cases, this means interviewing people with extreme beliefs of some kind, or just generally belonging to subcultures not known to exist by most or just frowned upon. It was first shown in the United Kingdom on BBC2. In 2001, Theroux was awarded the Richard Dimbleby Award as well as the Best Presenter BAFTA for his work on the series.

Theroux's view on Weird Weekends:

Weird Weekends sets out to discover the genuinely odd in the most ordinary setting. To me, it's almost a privilege to be welcomed into these communities and to shine a light on them and, maybe, through my enthusiasm, to get people to reveal more of themselves than they may have intended. The show is laughing at me, adrift in their world, as much as at them. I don't have to play up that stuff. I'm not a matinee idol disguised as a nerd.

In 2005 Louis released a book called The Call of the Weird: Travels in American Subcultures where he revisits people he previously interviewed for the Weird Weekends documentaries. He attempts to track down ten of his subjects, up to seven years after the shows, claiming a desire to see what "changes in their subcultures might say about the changes in the world at large", or at least "curious of what became of some of the odd folk [he] got to know".

He tracks down Thor Templar (alien resistance commander), JJ Michaels (porn star), Ike Turner (musician and ex-husband of Tina, from an uncompleted episode), Mike Cain (survivalist), Haley (prostitute), Jerry Gruidl (Aryan Nations), Mello T (pimp turned rapper), Oscody (survivor of Heaven's Gate, also from an incomplete episode), Marshall Sylver (Hypnotist), and Lamb & Lynx (the singing White Nationalist twins – aged 11).