Who Are the 12 Cylon Models

In the reimagined Battlestar Galactica continuity, the Twelve Cylon Models are the humanoid Cylon line that believes itself to be the next stage of human evolution, created by the Final Five to serve roles that mirror and oppose humanity. Across Seasons 1–4, the series identifies these models by designation and episode focus, assigning distinct motivations, vulnerabilities, and narrative functions. This guide clarifies who the 12 are in canonical order, how they appear across the main series and prequel Caprica, and how their relationships drive the saga’s core themes of identity, cycle of violence, and redemption.

The Canon List of the Twelve Cylon Models

The show settles on a consistent roster after the first-season revelation that Boomer is a Cylon. From that point forward, the series treats the Final Five’s creation of eight humanoid models, plus two experimental lines (the Centurions and the biological Centurion on the Hub) as background context, while the humanoid Twelve remain narratively central. The roster is:

Notes on Duplicate Numbers and Gaps

The show deliberately uses repeated numbers to signal that multiple copies of a model exist (e.g., multiple Number Sixes and Number Eights). Cavil is identified early as Number Seven before his model’s prior existence is fully detailed, and the series later confirms the existence of other copies. The canonical twelve are those actively featured in the main narrative; additional models exist in background material (like the newspaper reporter D’Anna encounters in Season 3) but are not central to the main cast arcs.

Narrative Role and Purpose of the Twelve

The Twelve serve as both philosophical foils and personal stakes for the human characters. Each model embodies a different critique or reflection of human traits: Cavil (One) represents ideological rigidity and resentment; Leoben (Two) preys on hope and faith; D’Anna (Three) pursues truth at any cost; Simon (Four) embodies medical ethics and hidden agendas; Aaron (Five) symbolizes banal complicity; the Sixes negotiate loyalty and identity; and the Eights bridge the divide between Cylon and human. Their interactions drive the series’ exploration of what it means to be human, the ethics of creation, and the possibility of breaking historical cycles.

Cylons vs Raiders: Different Creation Lines

It is important to distinguish the Twelve from the Centurion models and the Raiders. The Centurions are biomechanical units designed for labor and combat, programmed with limited AI. Raiders are bio-mechanical fighters with adaptive learning. The Twelve are sentient, human-equivalent beings created by the Final Five with downloaded memories and resurrection capability, making them the only line with true human-like consciousness and existential stakes in the series’ moral drama.

Key Episodes and Character Development

Across the series, specific episodes foreground individual Cylon models and deepen their portrayals. Early episodes establish key figures such as Boomer and Leoben, while later seasons reveal Cavil’s full ideological agenda, Daniel’s fate, and the complex loyalties of the Sharon models. The progression from infiltration and sabotage to open warfare and uneasy alliance illustrates how the Twelve evolve from antagonists to uneasy partners in the search for a shared future.

Canonical Sources and Timeline

Information about the Twelve is drawn primarily from the televised series across three main entries: Battlestar Galactica (2004–2009), Caprica (2009–2010), and the prequel context of The Plan (2009). The numbering and roles are consistent within the main continuity, though supplemental materials and extended canon sometimes introduce variations. The following table summarizes the core verified attributes of the primary models featured in the main show.

Common Points of Confusion

Fans often conflate the total number of humanoid Cylon models with the number actively seen. While the show confirms the existence of Twelve models, several appear only fleetingly or are referenced rather than shown. The repeated use of model numbers—especially Six and Eight—across multiple individuals can make tracking identities difficult. Additionally, the introduction of ‘Number Seven’ late in Season 4 clarifies Cavil’s own model without retroactively changing earlier depictions. Understanding these distinctions helps clarify character motivations and the series’ larger themes of repetition and divergence.

Thematic Significance of the Twelve

The choice of twelve is deeply symbolic within the series, invoking biblical and mythological traditions of completeness while subverting them. The Twelve are not a perfect cycle but a flawed family, embodying both the capacity for cruelty and the possibility of empathy. Their journey—from creators who abandoned their children to beings seeking coexistence—mirrors the human struggle to reconcile history with the desire for a better future. By anchoring the narrative in these specific models, the series personalizes abstract questions about identity, memory, and responsibility.

Legacy and Continuing Influence

Even after the series concluded, the Twelve remain central to discussions of the show’s moral architecture and political allegory. Analysis of each model’s arc continues to inform fan discourse, critical essays, and academic examinations of serialized storytelling. Their enduring prominence reflects the strength of the writing and performance, particularly in rendering philosophical dilemmas through recognizable, emotionally resonant characters. For ongoing viewers and newcomers alike, understanding the Twelve provides a reliable lens for engaging with the series’ core questions about humanity and what follows after.