I recently found the Ridley Scott hosted documentary on Netflix. It profiles the sci-fi giants of Robert Heinlein, George Lucas, Jules Verne, and several other. I'm only watching 1 episode a week to really give my brain time to steep in their genius juices. So far I have covered Robert Heinlein and Isaac Asimov. I don't know which I'll choose next.
Definitely give it a watch.
Prophets of Science Fiction