One of the twentieth century's most pioneering science fiction authors, Clifford D. Simak had a special fondness for robots. Not only did these thinking machines represent the boundless possibilities of technology, they also had the potential to bring--in his words--"the kindness and the courage that I thought were needed in the world." The stories in this volume offer a variety of Simak's unique robot visions. In "Lulu," a robot built for planetary exploration takes on a female identity, causing unforeseen challenges for her three-man crew. An examination of an unknown planet reveals the celestial body to be a single, gigantic computer whose origins and purpose are a mystery, in "Limiting Factor." And in the title story, Simak returns to his longest-running robot character, Jenkins, who reflects on all that has come and gone one last time.