Robert Sheckley

• Immortality, Inc. (1959)
  • 1959 Hugo Nominee for Novel
• "Seventh Victim" (April, 1953)
  • Published in Galaxy magazine
  • Expanded as The Tenth Victim (1966) by Robert Sheckley
• The Game of X (1965)
• The Tenth Victim (1966)
• Time Killer (October, 1958)
  • Also known as Immortality Delivered
  • Published in Galaxy magazine
  • Expanded as Immortality, Inc. (1959) by Robert Sheckley
    • 1959 Hugo Nominee for Novel