This was a pretty good documentary about Universal's Invisible Man series. It goes into the most detail about the first one, with looks at HG Well's novel, director James Whale, lead actor Claude Rains. It does cover the other Universal Invisible Man movies, but doesn't look at other adaptations of Wells' novel. It also goes into some of the tricks that were used to create the appearance of an invisible man.
There are interviews with film historians, some of the living people involved with the films, or at least their friends or family members. They all have something interesting or funny to say. Claude Rains' daughter tells a tale of how her father took her to see the movie, and he was bundled up much like his character.
Also interesting was how The Invisible Man followed Whale's Frankenstein with certain plot elements retried in similar ways, trying to get them better. It's also asserted that the film part draws from the novel The Murderer Invisible by Philip Wylie.
