维克多·布鲁诺

Victor Buono

饰：Homer the Archivist

瑞克·欧弗顿

Rick Overton

饰：Ino the Computer

Bernard J. Carr

饰：Himself

Frank Drake

饰：Himself

Ronald Evans

饰：Himself

Alicia Heineman

饰：Alien Captain

约翰·肯尼迪

John F. Kennedy

饰：Himself

Valery Kubasov

饰：Himself

Aleksei Leonov

饰：Himself

Willard Frank Libby

饰：Himself

艾萨克·阿西莫夫

Isaac Asimov

饰：Self

Eugene Cernan

Eugene Cernan

饰：Self,(archive footage)

帕特丽夏·莫里

Patricia Mauceri

饰：Alien Girl #1

菲利普·莫里森

Philip Morrison

饰：Self,(as Dr. Philip Morrison)

Jerry Pournelle

饰：Self

Harrison Schmitt

饰：Self,(archive footage)

George Wald

饰：Self,(as Dr. George Wald)

亚历山大·卡赞采夫

Александр Петрович Казанцев

饰：Self,(as Dr. Alexander Petrovich Kazantsev)

拉里·尼文

Larry Niven

饰：Self

卡尔·萨根

Carl Sagan

饰：Self,(as Dr. Carl Sagan)

Eugene Shoemaker

饰：Self,(as Dr. Eugene Shoemaker)

Fred Lawrence Whipple

饰：Self,(as Dr. Fred L. Whipple)