Victor Buono
Homer The Archivist
Acting
Rick Overton
Ino The Computer (voice)
Acting
Carl Sagan
Self
Acting
Isaac Asimov
Self
Writing
Eugene Cernan
Self (archive footage)
Acting
Bernard J. Carr
Self (as Dr. Bernard Carr)
Acting
Frank Drake
Self (as Dr. Frank Drake)
Acting
Ronald E. Evans
Self (archive footage)
Acting