This major two-volume collection presents Darko Suvin's critical meditations on science fiction and utopia from the late 1960s through the early years of the new millennium, excluding only the landmark monographs Metamorphoses of Science Fiction, Victorian Science Fiction, and Defined by a Hollow. From essential programmatic statements charting the parabolic logic of science fiction and establishing the parameters of a theoretically supple and rigorously historical SF criticism to confrontations with both a postmodernist abdication of politics and a "neutral" sociology of literature, these writings reflect the evolving thought of the preeminent contemporary theorist of science fiction. Underpinned by a method of heretical cognition and the steadfast insistence of utopian possibility, the varied essays, interviews, poems, and polemics presented here-encompassing four decades of sustained thought on the topic-offer up the affirmation of freedom as the truest horizon of science fiction.