The link below will take you to an excellent documentary called THE DREAM PIONEERS. It begins with a discussion of the famed Los Angeles Science Fantasy Society, and then concentrates on three of its most famous members: Ray Bradbury, Forrest J Ackerman and Ray Harryhausen. It appears to date from around 1999. Hope you enjoy the film as much as I did!

https://www.youtube.com/watch?v=HPDextDFX0g