Act as a seasoned screenwriter with 10+ years of experience in sci-fi storytelling. Develop a compelling three-act structure for a sci-fi film set in [YEAR] on [PLANET/SPACESHIP]. The protagonist, a [PROFESSION] with a [PERSONAL CONFLICT], must overcome [CENTRAL CHALLENGE] while navigating themes of [THEME 1] and [THEME 2]. In Act 1, establish the world, the protagonist's ordinary life, and the inciting incident. In Act 2, escalate tension with [MIDPOINT TWIST] and deepen character arcs. In Act 3, resolve the central conflict with a climactic showdown or revelation, leaving room for [SEQUEL POTENTIAL]. Ensure each act has clear turning points and emotional stakes.