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Added Notes:

• The ISBN of this ebook is duplicated by WebScriptions from the original Baen trade paperback edition.
• Contents are not paginated, so placeholder numbers entered to retain the correct order.
• The Plague of Masters — originally published in Fantastic, December 1960 and January 1961, under the title A Plague of Masters. Copyright © 1960 by Ziff-Davis Publications, Inc. Reprinted 1961 by Ace Books, Inc. under the title Earthman, Go Home!
• Hunters of the Sky Cave — originally published in Amazing Stories, June 1959, in a shorter version under the title A Handful of Stars. Copyright © 1959 by Ziff-Davis Publications, Inc. Reprinted 1959 by Ace Books, Inc. under the title We Claim These Stars!.
• The Warriors From Nowhere — originally published in Planet Stories, Summer 1954, under the title The Ambassadors of Flesh. Copyright © 1954 by Love Romances Publishing Co., Inc. Revised version in Agent of the Terran Empire, Ace Books, Inc., 1980. Copyright © 1980 by Poul Anderson.