Post-apocalyptic themes often recur in science-fiction works. In fact, literary critics often label it as a subgenre of science-fiction, as it most often appears in futuristic settings. However, not all post-apocalyptic works can be labeled as science fiction. Since the genre has very defined aspects, post-apocalyptic fiction cannot be completely marked as a part of SF. One of the works I will discuss in this paper, namely Bernard Malamud’s God’s Grace, doesn’t really fit the science-fiction genre in many aspects, but still, it is set in a post-apocalyptic world. Thus, this paper will not be an elaboration of post-apocalyptic science-fiction only, but the post-apocalyptic and apocalyptic visions in the novels Cat’s Cradle (by Kurt Vonnegut Jr.), God’s Grace (by Bernard Malamud) and Forward the Foundation (by Isaac Asimov) and how they reflect to the society of various parts of the second half of the 20th century.