Aycock, Roger D. 1914-2004 creator text utu 2021 monographic en 1 online resource : multiple file formats "Ultimatum" by Roger D. Aycock is a science fiction novel written in the early 1950s. The story revolves around an encounter between an Earthman, Winant, and an alleged Martian envoy named Yardana, who comes to warn humanity about the dangers of their technological advancements and the influence of alien entities on Earth. The narrative unfolds in a tense atmosphere where the stakes involve the fate of multiple worlds due to human warfare and scientific progress. The plot is set in a small Indiana hotel room, where Winant encounters his uncle, who claims to be from Mars. As the story progresses, Yardana reveals that Martians have been observing Earth and perceive humanity's atomic discoveries as a significant threat, potentially endangering their civilization. Winant, initially skeptical, learns that Yardana is on a mission to advocate for Earth's destruction to safeguard the Martian way of life. However, the story takes an unexpected twist as Winant reveals his own intentions, equipped with a weapon from Venus, leading to a dramatic and shocking conclusion that questions the motivations and survival instincts of different civilizations. (This is an automatically generated summary.) Release date is 2021-03-05 Greg Weeks, Mary Meehan and the Online Distributed Proofreading Team at http://www.pgdp.net Original publication data not identified Science fiction Short stories Human-alien encounters -- Fiction Earth (Planet) -- Fiction PS Original publication data not identified https://www.gutenberg.org/ebooks/64702 https://www.gutenberg.org/ebooks/64702 UtSlPG 260607 20260610134507.0 64702