Magnus Magnusson interviewed Carl Sagan, Stephen Hawking and Arthur C. Clarke for a 1988 ITV Central television show called "God, The Universe and Everything Else." Topics discussed include cosmology, time travel, contact with extraterrestrials, the Mandelbrot set, creativity, and God.
The video has made its way to Youtube [youtube.com]. Its duration is about 51 minutes.
further information:
IMDB entry [imdb.com]