On screen
Cast
12 credited performers
Arthur C. Clarke
Self
Keir Dullea
Self
Freeman Dyson
Self
Artwork unavailable
Wally Gentleman
Self
Artwork unavailable
Daniel Goldin
Self
Peter Kuran
Self
Larry Niven
Self
Daniel Richter
Self
Artwork unavailable
Robert J. Sawyer
Self
Artwork unavailable
Richard Terrile
Self
Douglas Trumbull
Self
Artwork unavailable
David Pritchard
Narrator