Despite a rapidly growing body of research exploring young activists’ experiences within the climate justice movement, limited research has examined how they imagine alternative ecopolitical futures rooted in climate justice. Extending research on radical and political imagination, this study used in-depth, semi-structured interviews to explore how 16 young activists (ages 15–17) from across the United States envision a world where the climate justice movement has prevailed. Through reflexive thematic analysis, I generated a series of five storylines encapsulating young activists’ visions of a climate-just world. These storylines reimagined four domains of life through a climate justice lens—(1) (built) environments, (2) living conditions, (3) relationships, and (4) well-being—as part of a larger, never-ending story (5) to realize the beauty of a climate-just world through the boundless and ceaseless struggle that will be required to continually enable its existence. Findings emphasize that young activists’ collective visions of just climate futures encompass much more than stopping climate change. Advancing climate justice, to them, is a matter of upending entrenched systems of domination, exploitation, and extraction that simultaneously fuel climate breakdown and perpetuate widespread human suffering—an enormous task requiring mass mobilization and collective action to demand structural and policy change.