 The Hitchhiker's Guide series was a BBC radio program first, although the books are very popular and justifiably so because they're very good. The original radio program is the definitive version. But it ran for several seasons so there are many hours of it. This right here is my favorite version. It's a dramatization of the novels using many of the same people and sound effects from the radio program so it's like a condensed version of the radio shows. These are hard to find and I honestly don't remember where I got them. I've had them for many years but luckily they've been digitized and uploaded onto the internet in their entirety and I have links to them in the description below.