This film is an edited version of a symposium held at Boston University on November 20, 1972 that explores the implications of the possible existence of extraterrestrial life within the galaxy and the universe. The panel members were Dr. Richard Berendzen, astronomy professor and historian of science at Boston University; Dr. Ashley Montagu, anthropologist, social biologist and author at Rutgers University; Dr. Philip Morrison, physicist educator and philosopher of science at Massachusetts Institute of Technology (MIT); Dr. Carl Sagan, astronomer and exobiologist at Cornell University; Dr. Krister Stendahl, clergyman and theologian at Harvard University; and Dr. George Wald, biologist at Harvard University.