Cast of the 100 – Main Actors, Characters and Seasons

The 100 stands as one of The CW’s most ambitious sci-fi productions, spanning seven seasons from 2014 to 2020. At its center, the series follows a group of juvenile delinquents sent to Earth to test whether the planet is habitable after humanity’s apparent destruction. Understanding the cast of The 100 requires navigating an ensemble that grew, evolved, and transformed across more than 100 episodes. This guide compiles the main actors, recurring performers, and character mappings from all seven seasons.

The show distinguished itself through bold casting decisions and willingness to promote recurring characters to series regular status. Several actors who began in supporting roles—including Lindsey Morgan as Raven Reyes, Ricky Whittle as Lincoln, and Richard Harmon as John Murphy—eventually became central figures in the narrative. The series also featured notable multi-character portrayals, with Paige Turco alone playing three distinct roles: Abby Griffin, Simone Lightbourne, and The Judge.

Tracking the The 100 main cast across seasons reveals a dynamic ensemble that reflected the show’s evolving storylines. From the original 100 juveniles and Ark adults in season one to the expanded mythology of Sanctum and the Transcendence arc in season seven, the cast grew to accommodate increasingly complex narratives. Below, this guide breaks down every major casting development, character assignment, and season-by-season evolution.

Who Are the Main Cast Members of The 100?

The main cast of The 100 formed the backbone of a series that explored themes of survival, morality, and leadership. From the pilot episode through the series finale, five actors appeared in every season as series regulars: Eliza Taylor, Bob Morley, Marie Avgeropoulos, Richard Harmon, and Lindsey Morgan. Their characters—Clarke Griffin, Bellamy Blake, Octavia Blake, John Murphy, and Raven Reyes respectively—anchored the show’s shifting ensemble.

Key Insights About the Main Cast

• Eliza Taylor, an Australian actress, was cast as Clarke Griffin after auditioning via self-tape from her home country, a decision that proved pivotal to the series’ international recognition.
• The show maintained remarkable stability in its core ensemble, with Taylor, Morley, and Avgeropoulos appearing in every episode of the series.
• Paige Turco stands out as the only actor to portray three separate characters within the same series—Abby Griffin, Simone Lightbourne, and The Judge.
• Several main cast members transitioned from recurring to series regular status, including Lindsey Morgan (promoted after season 1), Ricky Whittle (season 2), and Richard Harmon (season 3).
• The ensemble featured significant international diversity, with actors from Australia (Taylor, Avgeropoulos), New Zealand (Morley), and various North American backgrounds.
• Character deaths frequently altered the cast composition, with Thomas McDonell (Finn Collins) departing after season 2 and Devon Bostick (Jasper Jordan) leaving after season 4.

Who Plays Key Characters Like Clarke and Bellamy?

The actors behind The 100’s most iconic characters brought depth and nuance to roles that evolved significantly over seven seasons. Understanding who plays Clarke Griffin, Bellamy Blake, and the other central figures requires examining both their performances and their characters’ narrative arcs. For those interested in exploring the broader context of The 100 seasons, the show’s character development offers rich material for analysis.

Clarke Griffin — Eliza Taylor

Eliza Taylor, an Australian actress born in 1989, landed the role of Clarke Griffin after an international casting search. Taylor had previously appeared in Australian television productions including Blue Water High and Packed to the Rafters before her breakout role as the reluctant leader of the 100. Her portrayal of Clarke transformed from sheltered outsider to the ruthless “Wanheda” and eventually to a figure seeking peace through increasingly desperate measures.

Taylor’s performance earned critical recognition, with particular praise for her ability to convey moral anguish in scenes involving impossible choices. Beyond The 100, Taylor continued working in television and film, though Clarke Griffin remains her most internationally recognized role. She portrayed Clarke across all seven seasons, appearing in every episode except one during season 2 due to scheduling conflicts.

Bellamy Blake — Bob Morley

Bob Morley, originally from Australia, brought intensity and complexity to Bellamy Blake, the protective older brother of Octavia who became one of the show’s moral centers. Morley’s background in Australian soap operas, including a stint on Home and Away, provided a foundation for the emotional depth he brought to the character. Bellamy’s evolution from overprotective sibling to co-leader of the 100 and eventually to a controversial figure in the final season reflected Morley’s consistent ability to embody moral ambiguity.

Morley’s chemistry with Eliza Taylor anchored the series’ central relationship, which producers and critics frequently cited as the emotional core of the show. His performance in Bellamy’s final appearances in season 7 sparked significant discussion among fans regarding the character’s arc and eventual fate.

Octavia Blake — Marie Avgeropoulos

Marie Avgeropoulos, a Canadian actress of Greek descent, portrayed Octavia Blake across all seven seasons, charting one of television’s most dramatic character transformations. Beginning as the “girl under the floor”—the secret child hidden from authorities—Octavia evolved into a warrior, leader, and eventually the brutal Skairipa. Avgeropoulos brought physical intensity to the role, performing many of her own stunt sequences and training extensively in combat choreography.

Her character’s journey reflected the show’s willingness to explore how desperate circumstances reshape individuals, with Octavia’s descent into violence and subsequent redemption arc spanning multiple seasons.

Raven Reyes — Lindsey Morgan

Lindsey Morgan joined The 100 as Raven Reyes in a recurring capacity during season 1 before being promoted to series regular in season 2. An American actress with a background in film and television, Morgan brought technical expertise and emotional resilience to the character of the show’s primary mechanic. Raven’s arc as a survivor of physical trauma—including a spinal injury that required the use of a high-tech brace—offered one of the series’ most nuanced portrayals of disability and perseverance.

Morgan’s performance balanced technical problem-solving sequences with deeply personal storylines, particularly her character’s evolving relationships with other members of Spacekru.

The 100 Cast by Season: Season 1 to 7 Breakdown

The cast of The 100 underwent significant changes throughout its seven-season run, with characters regularly departing through deaths, departures, or promotions to recurring status. Understanding these shifts provides insight into how the show evolved narratively and demographically. Fans often compare the character journeys to other science fiction television series that featured ensemble casts over extended runs.

Season 1: The Original Ensemble

The inaugural season introduced audiences to the 100 juvenile delinquents and the Ark adults who sent them to Earth. The main cast included Eliza Taylor (Clarke), Thomas McDonell (Finn Collins), Bob Morley (Bellamy), Marie Avgeropoulos (Octavia), Devon Bostick (Jasper Jordan), Christopher Larkin (Monty Green), Eli Goree (Wells Jaha), and Richard Harmon (John Murphy, recurring). Supporting the delinquents, the adult ensemble featured Paige Turco (Abby Griffin), Isaiah Washington (Thelonious Jaha), Henry Ian Cusick (Marcus Kane), and Kelly Hu (Callie “Cece” Cartwig).

Season 1 established the fundamental character dynamics that would drive the series: the tension between Clarke’s emerging leadership and Bellamy’s protective instincts, Octavia’s secret status as the hidden child, and Murphy’s early development as an antagonist.

Major Cast Additions and Promotions

The show demonstrated a consistent pattern of elevating recurring characters to main status, a strategy that rewarded loyal viewers and allowed compelling new narratives to emerge. Lindsey Morgan’s promotion to main cast in season 2 coincided with Raven’s increasing narrative importance, as the character emerged as a central figure in the Ark’s survival efforts.

Ricky Whittle’s transition to main cast in season 2 accompanied Lincoln’s expanded role as a bridge between the Sky People and Grounders. However, Whittle departed the series after season 5, with Lincoln’s story concluded off-screen between seasons.

Season 7: Final Cast Configuration

The seventh and final season featured a blend of original cast members and newer additions. The main ensemble included Taylor, Morley, Avgeropoulos, Morgan, Harmon, Teles, Kook, Bourne, Modu, and Shelby Flannery as Hope Diyoza. Several original cast members departed before or during the season, including Henry Ian Cusick (Kane), Christopher Larkin (Monty, guest appearance), and others whose characters’ stories concluded in season 6.

The season explored new characters and mythology through the entities known as the Disciples and the concept of Transcendence, requiring the cast to adapt to unfamiliar narrative circumstances. This shift brought new faces while maintaining the core ensemble that audiences had followed for years.

Full Cast List for The 100

Beyond the main cast members, The 100 featured an extensive roster of recurring and guest performers who enriched the show’s world-building. These actors portrayed Grounders, Spacekru members, Sanctum inhabitants, and various other figures who influenced the story’s direction.

Recurring and Guest Stars

The series employed a deep bench of recurring performers, many of whom appeared across multiple seasons and became integral to the show’s mythology. Tati Gabrielle portrayed Gaia, the flamekeeper and priestess, from seasons 4 through 7, becoming a crucial link to the Commanders’ legacy. Jonathan Whitesell appeared as Bryan, a recurring character in season 3 and guest in season 4.

Michael Beach portrayed Charles Pike, the controversial leader who emerged in season 3, earning a guest appearance in season 6. Rhiannon Fish appeared as Ontari, one of the potential Nightblood successors, while Neil Sandilands played Titus, the FLIGHT priest who trained Clarke.

Notable Supporting Actors

Several actors appeared in significant supporting capacities without achieving main cast status. The Grounders and Coalition characters required extensive casting of performers who portrayed warriors, diplomats, and leaders within that civilization. Indra, played by an actress whose name appears in specialized fan resources, became one of the most consistent recurring figures across multiple seasons.

Anya, Lexa, and other early Gounder leaders established the complexity of Earth’s indigenous people, with Lexa’s arc particularly influencing the show’s emotional landscape. Maya, portrayed in later seasons, added dimension to the question of how survivors of different catastrophes might interact.

JR Bourne’s character arc exemplifies how supporting actors could become central figures. Initially appearing as the antagonist Russell Lightbourne in season 6, Bourne returned in season 7 playing the dual role of Lightbourne and the historical Commander Sheidheda, a dark presence from the past.

Cast Timeline: Promotions, Exits, and Evolution

The evolution of The 100’s cast followed a pattern of strategic promotions and narrative-driven departures that kept the ensemble fresh while maintaining connection to earlier seasons.

1. Season 1: Original cast established, including 8 main-billed actors and Richard Harmon in a recurring capacity.
2. Season 2 (2014–2015): Lindsey Morgan and Ricky Whittle promoted to main cast; Thomas McDonell’s Finn Collins killed off mid-season, marking the first major departure.
3. Season 3 (2016): Richard Harmon elevated to main cast as Murphy’s character gained importance; introduction of recurring antagonists and ally characters.
4. Season 4 (2017): Zach McGowan as Roan promoted to main cast; Devon Bostick’s Jasper Jordan killed off in the midseason finale.
5. Season 5 (2018): Tasya Teles as Echo promoted to main cast; introduction of new characters including Shaw and the prisoners from the Arctic ship.
6. Season 6 (2019): Shannon Kook as Jordan Green promoted to main cast; major exits including Christopher Larkin’s Monty Green and Isaiah Washington’s Jaha.
7. Season 7 (2020): JR Bourne and Chuku Modu promoted to main cast; final season featured the smallest core ensemble in the show’s history.

The final season’s cast reflected a deliberate contraction, with the narrative focusing on a smaller group navigating the Disciples’ faith and the possibility of Transcendence. This structural choice allowed for more concentrated character development at the cost of the sprawling ensemble that defined earlier seasons.

What Is Certain and Uncertain About The 100 Cast?

When compiling comprehensive cast information for a long-running series, certain details remain firmly established while others exist in areas of uncertainty or minor discrepancy between sources.

The core cast information for The 100—spanning main performers, their characters, and general season involvement—remains well-documented through official sources including TV Guide’s verified cast listings, Wikipedia’s sourced character pages, and The CW’s press materials. Minor discrepancies between sources typically involve episode counts or guest appearance classifications rather than fundamental character or casting decisions.

Behind the Casting: Production Context and Decisions

The casting of The 100 reflected deliberate choices that shaped the series’ identity and international appeal. Series creators Jason Rothenberg and his team built an ensemble that emphasized diversity in geography, ethnicity, and character background, creating a cast that reflected the show’s themes of humanity’s survival across cultural divides.

The decision to cast Australian actress Eliza Taylor as the lead demonstrated the show’s willingness to look internationally for talent, a choice that paid dividends as the series developed a global fanbase. Similarly, the recruitment of performers from various backgrounds—Pacific Islander, Asian-American, Latinx, and other underrepresented groups—contributed to the show’s reputation for inclusive storytelling.

The show’s casting directors, including Amber Collins and David H. Anderson, demonstrated particular skill in identifying recurring performers who could eventually carry larger narrative weight. Several actors promoted to main cast—including Tasya Teles and Shannon Kook—were initially cast in limited capacities before their characters proved compelling enough to warrant expanded roles.

Sources and References

This guide draws on established reference sources for television casting information. Official cast listings from TV Guide’s comprehensive cast database provide verified billing information for all main and recurring performers. The Wikipedia List of The 100 Characters offers detailed sourcing for character appearances and actor assignments across seasons.

“The 100 proved that broadcast television could sustain ensemble storytelling across seven seasons while maintaining narrative coherence and character development.” — Press coverage of the series finale, 2020.

Additional verification came from the Wikipedia page for The 100 television series, which tracks production history, cast changes, and critical reception. For detailed character arcs and actor backgrounds, MovieWeb’s comprehensive cast and character guide provided supplementary context on character evolution throughout the series.

The Grounder’s Source database offered specialized information on recurring cast members, particularly those playing Grounders and other recurring figures whose appearances spanned multiple seasons but whose billing remained non-regular.

Summary

The cast of The 100 represents one of the most dynamic ensembles in modern science fiction television, evolving across seven seasons to encompass dozens of memorable performances. At its center, five actors—Eliza Taylor, Bob Morley, Marie Avgeropoulos, Lindsey Morgan, and Richard Harmon—anchored the series through its most significant narrative shifts, appearing in nearly every episode across the show’s entire run.

Understanding the show’s cast requires recognizing both the stability of its core ensemble and the constant introduction of new performers who brought fresh perspectives to the mythology. From the original 100 juveniles to the inhabitants of Sanctum in later seasons, each casting decision contributed to a rich tapestry of characters whose stories intertwined, conflicted, and ultimately converged.

For viewers exploring the series for the first time or seeking to verify specific casting details, the information compiled in this guide provides a comprehensive starting point. The sources cited offer pathways to deeper exploration of individual actors, characters, and the production history that shaped their journeys.

Frequently Asked Questions