2001: A Space Odyssey to Dune: Part Two to Annihilation. The novels that produced films worth the books, and a few that did not.
Science fiction has produced both the most-canonical novel-to-film adaptations in cinema history and some of the most-disastrous failures. The genre's specific challenge is rendering the conceptual material of science-fiction novels — invented physics, alien intelligences, future societies — in the visual register of cinema without reducing the ideas to pure imagery. The films that succeed find ways to translate concept into film without abandoning either.
Our picks.
Science-fiction novel adaptations vary in how faithfully they translate their source material. 2001 was co-developed; Clarke's novel and Kubrick's film are, in some sense, parallel works rather than adaptation and original. Dune: Part Two is, by general critical consensus, the most-faithful Dune adaptation across multiple attempts (David Lynch's 1984 version is largely considered a failure; the SyFy Channel 2000 miniseries was respected but commercially small).
The most-divergent successful adaptations — Blade Runner, Annihilation, Starship Troopers — are the ones where the director openly took the source material as a starting point rather than as a template to honour. Verhoeven's Starship Troopers is structurally a satire of Heinlein's politics rather than a film of Heinlein's novel; Garland's Annihilation extracts the emotional content of VanderMeer's book but invents most of the specific plot. These are, in some sense, parallel works rather than literal adaptations. They succeed because they treat the source as the beginning of a conversation rather than as the conversation itself.