A desert, a tropical rainforest, a savanna and an ocean; Biosphere 2 had it all. The gigantic project was contrived by charismatic commune leader John P. Allen. When he met rebellious billionaire Ed Bass, his extraordinary dream came true and a team of eight "bionauts" was assembled. One of them was Belgian Mark Van Thillo, who would eventually play an important role in the unusual events that took place in the Biosphere. Director Matt Wolf tells this unimaginable story with compelling behind-the-scenes footage. The ups and downs of these eight people reveal a fascinating history that shows that a utopian dream is hard to reconcile with "big business", but also that persistent dreamers can move mountains.