What does a Martian really look like? What sort of creature would we meet on the planet Medea? Commander Rick finds out this week as he talks with some of the foremost designers of alien creatures in science fiction: Nancy Kress (An Alien Light), George R.R. Martin ("Sandkings"), Robert J. Sawyer (Foreigner), Greg Bear (Anvil Of Stars), Poul Anderson ("The Sharing Of Flesh"), Hal Clement (Mission Of Gravity), William Stout (preliminary design work on The Predator), Kelley Jones (artist: Alien: Hive), Steve Perry (Aliens: Earth Hive), Kevin O'Donnell, Jr. (Fire On The Border) and Larry Niven (Ringworld).