If you just finished watching ‘Biosphere’ and immediately opened a new tab to figure out what actually happened, you are far from alone. The final stretch of ‘Biosphere’ hinges on a biological transformation that reframes everything the two men thought they knew about survival. That transformation eventually pushes the story into genuinely uncharted territory for a film built around two guys stuck in a dome. This revelation makes Billy lose hope in having any kind of life at all, at least for a moment. Whether you found the ending profound, baffling, or a little bit of both, ‘Biosphere’ clearly wants its final moments to be argued over rather than neatly explained.