PremiereLens readStuart Fails to Save the Universe pitches itself as a high-concept science fiction comedy where the stakes are genuinely enormous and the protagonist is genuinely, chronically unequal to them. The humor comes from that gap collapsing repeatedly: universe-ending crises deflate into small personal humiliations, and grand heroic moments curdle into awkward, low-grade disasters. It is absurdist sci-fi filtered through sitcom-scale self-doubt.
Stuart's incompetence is not a hurdle he eventually clears; it is the whole point. Each attempt to rise to the occasion becomes its own comedy of deflation, where the fantasy and science fiction machinery exists mainly to manufacture new and increasingly elaborate ways for things to go wrong for one very unlucky person. The cosmic backdrop makes the smallness funnier.