Cast of Best Medicine: Meet the Stars and Characters of the Fox Series

The Cast of Best Medicine plays a major role in making Fox’s medical comedy-drama feel lively, warm, and easy to follow. The series brings together established television stars, veteran comic performers, experienced stage actors, and a wide range of supporting characters, all built around Josh Charles’ central performance as Dr. Martin Best.

Best Medicine is the American adaptation of the long-running British hit Doc Martin. At the heart of the story is Martin Best, a highly skilled Boston surgeon who abruptly leaves behind a prestigious medical career and starts a new life as a general practitioner in the small fishing village of Port Wenn, Maine. His ability as a doctor is rarely in doubt. His ability to deal with people, however, is another matter.

Martin is direct, impatient, and often unintentionally rude. That creates immediate friction with the people around him, especially in a close-knit town where everyone knows everyone else. According to Fox’s official description, the one-hour series combines medical cases with comedy, personal relationships, and Martin’s gradual involvement in a community he initially seems determined to keep at a distance.

For anyone looking for a clear guide to the Best Medicine Cast And Characters, the sections below explain the main actors, their roles, how the characters connect, and what viewers should know as the series moves into its second season in 2026.

Quick Bio Information

Fox’s current materials confirm that Best Medicine Season 2 is scheduled to premiere on September 22, 2026. They also identify Abigail Spencer’s character as Louisa Gavin. That point is worth clarifying because some earlier casting reports used the surname Glasson, a name closely associated with the British source material. For current coverage of the Fox series, Gavin is the more accurate name to use.

Josh Charles As Dr. Martin Best

Josh Charles leads the Cast of Best Medicine as Dr. Martin Best, the physician around whom nearly every major storyline revolves.

Martin begins the series as an accomplished surgeon in Boston. Rather than continuing along the prestigious path he has already built, he unexpectedly leaves the city and returns to Port Wenn, the coastal community where he spent part of his childhood. There, he takes on a very different role as the town’s general practitioner.

From a medical standpoint, Martin is exceptionally capable. Difficult diagnoses don’t intimidate him, and unusual symptoms often bring out his strongest qualities. He is observant, decisive, and highly confident in his professional judgment. The problem comes when he has to explain himself to patients.

Martin’s bedside manner is blunt enough to offend people almost immediately. He has little patience for social niceties and tends to say exactly what he thinks, whether the moment calls for it or not. In a village built on familiarity and personal relationships, that approach makes him stand out in all the wrong ways.

Charles is particularly well suited to the role because he can move comfortably between dry comedy and serious emotional material. Viewers may know him best as Will Gardner from The Good Wife, but his career also includes Sports Night and a long list of dramatic television roles. That experience helps give Martin more depth than the familiar stereotype of the difficult doctor. He can be frustrating, funny, vulnerable, and highly competent, sometimes within the same scene.

Abigail Spencer As Louisa Gavin

Abigail Spencer plays Louisa Gavin, one of the most important characters in Martin’s life and one of the emotional anchors of the series.

Louisa is a local schoolteacher with deep roots in Port Wenn. She understands the town in a way Martin doesn’t, and that contrast shapes much of their relationship. While he tends to approach problems clinically, Louisa is far more comfortable dealing with the emotional side of people and community life.

She also refuses to be intimidated by Martin’s intelligence or professional status. When he behaves badly, Louisa is willing to call him out. That makes their conversations more interesting than a simple romantic setup. Their connection grows out of tension, disagreement, curiosity, and a gradual recognition that there may be more beneath Martin’s difficult exterior than he allows people to see.

Spencer brings considerable television experience to the role. Her previous credits include Suits, Rectify, Timeless, and Mad Men, all of which showed her ability to handle emotionally complicated characters.

Louisa’s story is also connected to Sheriff Mark Mylow, her former fiancé. That history gives her personal storyline another layer and creates emotional complications around Martin without reducing her role to a romantic interest. She remains a character with her own place in Port Wenn and her own relationships within the community.

Josh Segarra As Mark Mylow

Josh Segarra plays Mark Mylow, Port Wenn’s sheriff and one of the town’s most socially connected residents.

Mark stands in sharp contrast to Martin. He understands the personalities, habits, and history of the people around him, while Martin often appears uncomfortable with even basic conversation. As sheriff, Mark naturally becomes involved in local disputes and community matters, but he also functions as someone who knows how Port Wenn works on a personal level.

His history with Louisa is equally important. Because Mark is her former fiancé, he remains closely tied to one of Martin’s most significant relationships. The series uses that connection to create tension, but Mark isn’t presented simply as an obstacle. His role in the community gives him relevance beyond romance.

Segarra has a strong background in character-driven television and comedy, with credits including Abbott Elementary, Sirens, and The Other Two. His natural energy suits Mark, whose approachable personality helps balance Martin’s tendency to shut people out.

Annie Potts As Aunt Sarah

Annie Potts plays Aunt Sarah, a character whose connection to Martin reaches back much further than his new medical practice.

Port Wenn isn’t completely unfamiliar to Martin. He spent summers there as a child, and Sarah is one of the clearest links to that period of his life. Her presence allows the series to explore Martin’s past rather than treating him only as a difficult doctor who has arrived in town without history.

Sarah also occupies a unique position in his life. Unlike many residents, she knows him personally and can speak to him with the confidence that comes from family history. She is capable of understanding some of the pain behind his behavior while still holding him accountable when he crosses a line.

Potts brings decades of experience to the part. Her career includes Designing Women, Young Sheldon, Any Day Now, and the Ghostbusters films. That long history in both comedy and drama makes her a natural fit for a show that often needs to move between warmth, humor, family tension, and more serious emotional moments.

Cree As Elaine Denton

Cree plays Elaine Denton, Martin’s assistant and one of the people who has to deal with his personality at particularly close range.

Because Elaine works directly in the medical practice, she provides an important bridge between Martin’s professional life and the wider community. The doctor may prefer a quiet, efficient workplace, but that goal is difficult to achieve in Port Wenn, where personal conversations and local relationships seem to enter every part of daily life.

Elaine’s position makes her especially useful to the story. She sees Martin at work, interacts with patients, and remains connected to the social world he often struggles to understand.

Fox lists Cree among the principal members of the Best Medicine Cast, confirming that Elaine is part of the show’s core ensemble rather than a background figure. Her presence helps prevent the medical practice from becoming an isolated setting and keeps Martin connected to the very community he so often tries to avoid.

Stephen Spinella And Jason Veasey As Greg And George

Stephen Spinella plays Greg Garrison, while Jason Veasey appears as George Brady. Together, Greg and George are a married couple who run The Salty Breeze, one of Port Wenn’s local gathering places.

Their importance comes partly from where they fit into the town. A community-focused series needs spaces where characters can meet outside work and home, and The Salty Breeze gives the show exactly that. It becomes a natural setting for conversations, arguments, celebrations, rumors, and the everyday social life that makes Port Wenn feel lived in.

Greg and George began as recurring characters, but their roles have grown. Spinella and Veasey have been promoted to series-regular status for Season 2, suggesting that the writers intend to make them even more central to the town’s ongoing stories.

The creative team has spoken positively about what both actors bring to the series, particularly their mix of humor and warmth. Their expanded presence also reflects one of the show’s strengths: Port Wenn increasingly feels like an ensemble community rather than a backdrop for Martin’s medical cases.

Didi Conn As Geneva Potter

Didi Conn appears as Councilwoman Geneva Potter, adding another recognizable personality to the Best Medicine Characters.

Geneva represents the civic side of Port Wenn. As a councilwoman, she is naturally positioned to become involved in town decisions, community events, and local disagreements. In a place this small, however, public matters rarely stay separate from private relationships.

That makes Geneva a useful character for the storytelling. She can participate in plots connected to local government while still being part of the town’s wider social life.

Conn remains best known to many viewers as Frenchy in Grease. Her long experience with comedy gives her a natural place in a series that often finds humor in the clash between official responsibilities and the eccentric behavior of ordinary residents.

Clea Lewis As Sally Mylow

Clea Lewis plays Sally Mylow, the local pharmacist in Port Wenn.

Her profession makes Sally an obvious part of the show’s medical world. Prescriptions, treatment plans, and patient concerns can naturally bring her into contact with Martin, while her position in town allows her to participate in broader community stories as well.

Lewis is known for television work that includes Ellen, and her comic timing fits the lighter side of Best Medicine.

One detail that should be handled carefully is Sally’s surname. She shares the name Mylow with Sheriff Mark Mylow, but readers shouldn’t automatically assume a specific family relationship unless the series establishes one directly. Making that distinction matters in a trustworthy cast guide because shared names can easily lead to unsupported assumptions.

John DiMaggio And Carter Shimp As Bert And Al Large

John DiMaggio plays Bert Large, a local handyman, while Carter Shimp appears as Bert’s son, Al Large.

DiMaggio is especially familiar to audiences because of his extensive voice-acting career. He is best known as Bender in Futurama and Jake in Adventure Time. Best Medicine gives viewers the chance to see him in a live-action role rather than simply hear one of his instantly recognizable voices.

Bert and Al also broaden the picture of Port Wenn. Their father-and-son relationship adds another family dynamic to the series and helps establish that the town’s residents have their own histories and problems independent of Martin.

Shimp, who appeared in The Holdovers, brings a younger presence to the ensemble. Together, Bert and Al help make Port Wenn feel less like a collection of supporting characters and more like a genuine community where relationships existed long before Martin returned.

Cindy De La Cruz As Jeannie

Cindy De La Cruz plays Jeannie, another schoolteacher in Port Wenn.

It is easy to confuse her role with Louisa Gavin’s because both women work in education, but they are separate characters with different places in the story.

Jeannie helps expand the school-related side of Port Wenn. That matters in a medical series set in a small community, where children, parents, teachers, and local events can easily intersect with Martin’s work.

De La Cruz has appeared in television productions including Blue Bloods. Her role may not dominate the series, but characters such as Jeannie are important because they help build the impression that Port Wenn has a functioning social world beyond the doctor’s office.

Wattson As Copernicus

One of the more unusual members of the Cast of Best Medicine is Wattson, the dog who plays Copernicus.

Copernicus is a stray who becomes attached to Martin, despite the doctor’s obvious preference for keeping emotional and physical distance from almost everyone around him.

That makes the dog more than a source of easy comedy. Copernicus quietly mirrors one of the show’s central themes. Martin repeatedly tries to protect himself through isolation, yet Port Wenn keeps finding ways into his life. The dog simply does it with fewer social rules.

Copernicus also helps soften scenes that might otherwise lean too heavily into Martin’s difficult personality. His presence adds warmth without forcing the doctor into emotional conversations he isn’t ready to have.

Martin Clunes As Dr. Robert Best

Martin Clunes provides one of the strongest direct links between Best Medicine and the original Doc Martin.

Clunes spent years playing Dr. Martin Ellingham in the British series. In the Fox adaptation, however, he takes on a different role as Dr. Robert Best, the father of Josh Charles’ Martin.

The casting works especially well for viewers familiar with the source material. Longtime Doc Martin fans immediately understand the significance of seeing Clunes appear opposite the actor now leading the American version. At the same time, new viewers can follow Robert purely as an important figure in Martin Best’s complicated family history.

His appearance adds emotional weight because it allows the series to explore where some of Martin’s behavior may have come from. Rather than leaving his personality unexplained, the show has room to examine the family dynamics that shaped him.

Clunes is also expected to return in Season 2, making his involvement more substantial than a one-time nod to the original series.

How The Best Medicine Characters Connect

One of the strongest features of the series is the way its characters overlap rather than existing in isolated storylines.

Martin’s medical practice places him in contact with nearly everyone in Port Wenn. Louisa challenges him emotionally and socially. Mark is tied to both community life and Louisa’s past. Sarah connects Martin to his childhood. Elaine works beside him every day, while Greg and George help anchor the town’s social scene.

Characters such as Bert, Al, Geneva, Sally, and Jeannie add even more layers to that network.

This structure is important because Best Medicine isn’t simply a medical procedural built around a new patient every week. The medical cases give the episodes momentum, but the relationships create continuity.

At its core, the series asks what happens when a man who dislikes emotional closeness becomes responsible for the wellbeing of a town where privacy is difficult and personal connections are unavoidable. That idea gives the ensemble a clear purpose and keeps the supporting characters relevant to Martin’s own development.

Best Medicine And Its Connection To Doc Martin

Best Medicine is officially based on the format of the British series Doc Martin, but the Fox version is designed as an American adaptation rather than a simple copy.

The central idea remains familiar. A highly intelligent doctor with a difficult personality finds himself practicing medicine in a small coastal community where the residents are far more interested in his life than he would prefer.

The American series relocates that concept to Port Wenn, Maine, while building its own versions of the characters, relationships, and local culture.

The British original was produced by Buffalo Pictures in association with Homerun Film Productions. The Fox version is produced by Fox Entertainment Studios, while Fox Entertainment Global handles worldwide distribution.

The executive-producing team includes Ben Silverman, Rodney Ferrell, Howard T. Owens, Liz Tuccillo, Mark Crowdy, Philippa Braithwaite, Jay Karas, and Tyson Bidner. Jamie Babbit executive produced and directed the first two episodes.

The involvement of Mark Crowdy and Philippa Braithwaite is especially noteworthy because both are closely connected with Doc Martin. Their participation gives the American adaptation a direct creative link to the series that inspired it while still allowing Best Medicine to develop its own identity.

Best Medicine Season 2 In 2026

The series has already moved beyond its introductory phase. Fox has scheduled Best Medicine Season 2 to premiere on September 22, 2026, placing the show firmly within the network’s 2026–27 television lineup.

That date is particularly useful for readers because older articles may still describe Best Medicine as an upcoming midseason series. Those reports reflected the situation before the show premiered, but they no longer represent its current status.

Fox has also reported that Best Medicine reached 16 million multiplatform viewers around its debut. That early audience performance helps provide context for the network’s decision to continue the series.

Season 2 will also expand the importance of some familiar Port Wenn residents. Stephen Spinella and Jason Veasey have been promoted to series regulars as Greg and George, while Martin Clunes is expected to return as Robert Best.

Those changes suggest that the second season will continue developing the community around Martin rather than relying only on his individual medical cases.

Why The Cast Works So Well

The variety within the Best Medicine Cast is one of the show’s clearest strengths.

Josh Charles gives the series a convincing dramatic center as Martin. Abigail Spencer brings emotional intelligence and strength to Louisa, while Annie Potts adds the confidence and warmth of a highly experienced performer. Josh Segarra provides energy and approachability as Mark, and Cree gives the medical office its own personality through Elaine.

The supporting players are equally important.

Stephen Spinella and Jason Veasey help make Port Wenn’s social world feel active and believable. Didi Conn, Clea Lewis, John DiMaggio, Carter Shimp, and Cindy De La Cruz each represent different parts of the town, from local politics and healthcare to trades, family life, and education.

That balance keeps the show from becoming too dependent on a single character.

Martin may be the reason the story begins, but Port Wenn is the reason it can continue. The medical mysteries create weekly problems to solve, while the relationships between residents give the series its longer emotional arc.

Final Thoughts

The Cast of Best Medicine gives Fox’s medical comedy-drama much of its personality. Josh Charles anchors the series as Martin Best, a doctor whose skill with medicine is far stronger than his ability to connect with people, but the show succeeds because the characters around him are more than background figures.

Abigail Spencer’s Louisa brings emotional complexity. Annie Potts’ Aunt Sarah connects Martin to his past. Josh Segarra’s Mark ties together law enforcement, community life, and personal history. Cree’s Elaine keeps the medical practice connected to the wider town, while Greg and George increasingly help define Port Wenn’s social world.

The recurring cast adds still more texture, from Geneva and Sally to Bert, Al, Jeannie, and Copernicus.

For viewers discovering the show in 2026, there is also an important change in context. Best Medicine is no longer simply a new American adaptation waiting to see whether audiences will respond. It has completed its first season, earned a second-season renewal, and started expanding parts of its ensemble.

That makes the relationships within the Best Medicine Cast And Characters even more important. Martin may want to remain emotionally detached, but Port Wenn continues to make that increasingly impossible—and that tension is one of the main reasons the series has room to grow.

FAQs About The Cast of Best Medicine

Who Plays Dr. Martin Best?

Josh Charles plays Dr. Martin Best. Martin is a highly skilled former Boston surgeon who leaves his prestigious career and becomes the general practitioner in Port Wenn, Maine. He is excellent at diagnosing and treating patients, but his blunt personality and poor bedside manner regularly create conflict with the people around him.

Who Plays Louisa In Best Medicine?

Abigail Spencer plays Louisa Gavin. Louisa is a local schoolteacher who becomes one of the most important people in Martin’s personal life. She knows Port Wenn well, isn’t afraid to challenge Martin’s behavior, and has a complicated history with Sheriff Mark Mylow.

Who Plays Mark Mylow?

Josh Segarra plays Mark Mylow. Mark is Port Wenn’s sheriff and a familiar, socially connected figure within the community. His previous relationship with Louisa also places him close to one of Martin’s most important emotional storylines.

Who Plays Aunt Sarah?

Annie Potts plays Aunt Sarah. Sarah is closely connected to Martin’s childhood and to the summers he spent in Port Wenn. Because she knows him better than many people in town, she can understand some of what lies behind his difficult personality while still challenging him when necessary.

Is Martin Clunes In Best Medicine?

Yes. Martin Clunes appears as Dr. Robert Best, Martin’s father. His casting is especially significant because Clunes played Dr. Martin Ellingham in the original British Doc Martin. He is also expected to appear again in Season 2.

Who Plays Greg And George?

Stephen Spinella plays Greg Garrison, while Jason Veasey plays George Brady. Greg and George are husbands who run The Salty Breeze, a local gathering place in Port Wenn. Both performers have been promoted to series regulars for Season 2.

Is Best Medicine Based On Doc Martin?

Yes. Best Medicine is officially based on the Doc Martin format. It keeps the central idea of a brilliant but socially difficult doctor living and working in a small coastal community while adapting the concept, characters, and setting for an American audience.

When Does Best Medicine Season 2 Premiere?

Fox has scheduled Best Medicine Season 2 to premiere on September 22, 2026. The series returns as part of the network’s 2026–27 television schedule, with several supporting characters expected to take on larger roles.

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