BBC's Dangerous Knowledge explores the lives and work of Georg Cantor, Ludwig Boltzmann, Kurt Gödel and Alan Turing, fascinating figures all. It conveys their research with an intensity that provides a glimpse into their agonies, some imposed and many self-created. These guys didn't end well, but then endings aren't everything.
I object to what I consider the over-dramatization which mars some of the narration, with phrases like "Boltzmann had discovered one of the fundamental equations which makes the Universe work" (I have a feeling the Universe would work fine without us discovering the equation) being debatable at best, but this documentary does provides a good overview of three mathematicians and one physicist whose lives aren't usually covered. If you ignore the occasional dip into sensationalism it's a lot of fun, and very well-produced. Oh, and it was awesome to see interview clips with Roger Penrose!
As a result of watching this I'm now interested in the work of Hugo von Hofmannsthal.