Biosphere (2023) Timeline Explained – Every Event in Order

Billy discovers he is undergoing sequential hermaphroditism, the same biological phenomenon affecting the fish in their pond. This means his body is gradually developing female characteristics. The transformation is a result of the post-apocalyptic environment, which appears to be triggering this evolutionary change in both the fish and potentially humans as a survival mechanism.

Foreshadowing: The fish were the first to show signs of the transformation when Ray noticed them changing sex to continue breeding.

• billy transformation
• sequential hermaphroditism
• biological change
• evolution

Ray hesitates and withdraws emotionally because he is struggling with deep-seated homophobic beliefs that were instilled in him during his upbringing. Despite his growing feelings for Billy, his internalized beliefs create intense internal conflict, causing him to pull away even as Billy proposes they try to procreate together.

Foreshadowing: Ray's discomfort becomes apparent earlier when he feels uncomfortable touching Billy and experiences unexpected arousal, revealing his internal struggle.

• ray conflict
• homophobia
• upbringing
• emotional struggle
• parenthood

The fish are undergoing sequential hermaphroditism, a natural biological process where some species can change sex to ensure breeding can continue when population dynamics demand it. Since the last female fish died, leaving only males, the fish are adapting by transitioning to female to preserve the species, a survival mechanism that gives Ray and Billy hope for continuing humanity.

Foreshadowing: The tension in the fishpond begins when they realize the last female has died, putting their breeding efforts in jeopardy.

• fish hermaphroditism
• breeding
• survival
• population

After Billy starts menstruating and realizes his body is now capable of pregnancy, he sees it as a potential purpose for their survival, continuing the human race. Given that they are the last two people alive, Billy views creating new life as their responsibility and a way to give meaning to their existence in the post-apocalyptic world.

Foreshadowing: Billy's transformation becomes apparent after he learns about the fish's ability to change sex, and he connects his own bodily changes to this phenomenon.

• billy pregnancy
• parenthood
• humanity continuation
• purpose

A fierce storm strikes the dome and shatters several windows, creating life-threatening breaches in their only shelter. Billy and Ray must frantically dismantle the fishpond to use the materials to seal the broken windows and protect themselves from the harsh outside environment. This crisis forces them to work together desperately and sacrifice the fish they had been depending on.

Foreshadowing: Earlier tension about dwindling food supplies and the dome's fragility sets up this moment of crisis.

• storm damage
• dome breach
• survival crisis
• windows broken

The aurora borealis appearing in the sky represents a shift in their circumstances, it suggests the atmospheric and environmental conditions are changing after the apocalypse. While it brings a moment of awe and hope, it also coincides with the reality that their food supply is dwindling, leaving their ultimate fate ambiguous despite this beautiful natural display.

Foreshadowing: The storm itself marks a turning point in weather patterns, leading to this dramatic shift in the sky.

• aurora borealis
• hope
• environmental change
• ambiguous ending

After Billy reveals his pregnancy capability and suggests having a child, they choose to attempt procreation together. Despite Ray's initial hesitation due to his upbringing and Billy's own unease about his changing body, they decide to try. Their first attempt is awkward and covered by a sheet for modesty, but it ultimately leads to them sharing a kiss and reconciling their feelings.

Foreshadowing: The emotional tension building since Billy's transformation reaches a breaking point when they acknowledge their mutual feelings.

• intimacy
• procreation
• relationship
• billy ray connection

Ray finds himself uncomfortable with physical contact because Billy's changing body is triggering unexpected feelings of arousal in him. These new emotions confuse Ray, especially given his conservative upbringing, creating internal conflict about his identity and desires. His discomfort stems from grappling with feelings he has never experienced before.

Foreshadowing: This discomfort becomes evident during moments of physical proximity before they fully acknowledge their mutual attraction.

• ray feelings
• arousal
• physical contact
• identity confusion

The specific cause of the global apocalypse is not detailed in the summary. Billy carries guilt for what he perceives as his role in causing it, suggesting his decisions as President may have contributed, but the exact nature of the catastrophic event remains unclear and ambiguous throughout the story.

Foreshadowing: Billy's guilt is introduced early, hinting at his responsibility without revealing specifics.

• apocalypse
• earth destruction
• billy guilt
• president

Ray constructed a protective dome that shields them from the harsh, post-apocalyptic environment outside. They maintain a fishpond to provide food and attempt to sustain life. The dome serves as their sanctuary, but they face constant challenges including dwindling resources, the breaking dome windows during the storm, and the psychological toll of isolation as the last humans.

Foreshadowing: The dome is introduced as Ray's creation, establishing it as their only protection from the start.

• dome survival
• shelter
• fishpond
• resources