A big name-drop during the middle of the Russell episode was the sad story of Georg Cantor and his insanity-inducing continuum hypothesis. Anyone unaware of Cantor and his contributions might want to look at this clip from the Dangerous Knowledge BBC documentary. I thought it provided a good visual explanation of higher levels of infinity. But perhaps they horribly oversimplified it for the sake of television -- mathematicians, share your thoughts!
If you like the clip, you can find the whole episode out on the wild web.