Character Relationship Map: Vivarium

Characters

• Gemma (played by Imogen Poots) — protagonist

  Primary school teacher and Tom's girlfriend who visits the Yonder housing development. She is forced to raise a rapidly aging child, repeatedly attempts to escape, discovers Tom's corpse in a vacuum b...

• Tom (played by Jesse Eisenberg) — protagonist

  Landscaper and Gemma's boyfriend who tours the identical Yonder development. After being trapped, he sets the house on fire, digs a deep hole in the garden, discovers a corpse in a vacuum bag, falls i...

• Martin (played by Jonathan Aris) — supporting

  The unsettling real estate agent who shows Gemma and Tom house number 9 and mimics their conversation about children. He later appears aged and dying in the office, transfers his name tag to the Boy,...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Tom → Martin (Professional Agent And Client) — Their professional contact begins during the property viewing.

  Tom accompanies Gemma while Martin gives them a tour of house number 9 as a real estate agent.

• Gemma → Martin (Professional Agent And Client) — Martin controls their initial access to the development as its representative.

  Martin acts as the real estate agent who shows Gemma and Tom house number 9 at Yonder.

• Gemma → Tom (Romantic Partner) — Their romantic partnership is the emotional foundation of the story.

  Gemma is introduced as Tom's girlfriend, and they visit Yonder together as a couple.

Story Analysis

A couple is trapped in an artificial housing development and consumed by a cycle of forced parenthood, death, and replacement.

Plot Progression

1. The House That Returns — Gemma and Tom visit Yonder and meet Martin during a property viewing. After Martin disappears, every escape route returns them to house number 9.
2. Parenthood by Delivery — The trapped couple finds strange food and fails to escape. A new box delivers an infant with instructions that they must raise it to obtain release.
3. The Unwanted Family — The infant rapidly grows, imitates the couple, and demands care. Tom digs obsessively while Gemma searches for the unseen force responsible.
4. Buried Lessons — The strange book and the buried corpse reveal a repeating system of captivity. Tom becomes ill, dies, and is sealed and buried.
5. The Cycle Continues — Gemma attacks the child and enters the underground labyrinth, but returns to house number 9. She dies after learning the fate of mothers, while Martin's role passes to the child.