The Cast of Best Medicine brings together a mix of experienced television, film, and stage performers who give Fox’s medical dramedy its distinctive small-town feel. At the center is Josh Charles, who plays Dr. Martin Best, a brilliant surgeon whose move from Boston to the fictional Maine fishing village of Port Wenn puts him in a very different kind of medical environment.
Martin knows medicine inside and out. People, on the other hand, are another story. His direct manner and sometimes uncomfortable bedside style quickly put him at odds with patients, neighbors, and other members of the community. That contrast between professional confidence and social awkwardness drives much of the show’s humor and drama.
Best Medicine is based on the British hit Doc Martin, but Fox has given the concept an American setting and developed its own collection of characters and relationships. Rather than simply focusing on Martin’s medical cases, the series spends considerable time exploring the people around him and the community he would often prefer to avoid.
That ensemble becomes even more important in 2026. Season 2 premiered on September 22, 2026, following a first-season debut that Fox said reached 16 million multiplatform viewers. With familiar characters taking on larger roles and new storylines emerging, there’s plenty to explore when looking at the Best Medicine Cast And Characters.
Best Medicine Quick Bio Information
| Information | Details |
|---|---|
| Series Name | Best Medicine |
| Network | Fox |
| Genre | Medical Dramedy |
| Series Premiere | January 4, 2026 |
| Season 2 Premiere | September 22, 2026 |
| Lead Actor | Josh Charles |
| Lead Character | Dr. Martin Best |
| Main Setting | Port Wenn, Maine |
| Based On | Doc Martin |
| Louisa’s Actor | Abigail Spencer |
| Mark’s Actor | Josh Segarra |
| Aunt Sarah’s Actor | Annie Potts |
| Elaine’s Actor | Cree |
| Greg’s Actor | Stephen Spinella |
| George’s Actor | Jason Veasey |
| Production Company | Fox Entertainment Studios |
| Format | One-Hour Dramedy |
| Original Source | British Doc Martin Format |
| Season 2 Status | Currently Airing In 2026 |
Fox describes Best Medicine as a one-hour dramedy based on the internationally successful Doc Martin format. The network’s official materials identify Josh Charles, Abigail Spencer, Josh Segarra, Annie Potts, and Cree among the show’s central cast.
Josh Charles As Dr. Martin Best
Josh Charles leads the Best Medicine Cast as Dr. Martin Best, an accomplished surgeon who leaves his established career in Boston and heads back to the Maine community where he spent summers as a child. Once in Port Wenn, he takes on the role of the town’s general practitioner, a major change from the prestigious medical career he left behind.
There’s little doubt about Martin’s medical ability. He’s observant, decisive, and confident when faced with difficult cases. The trouble starts when he has to communicate with the people he’s treating.
Martin has little patience for small talk or social conventions. He tends to say what he thinks, even when the situation calls for tact. In a close-knit town where residents know one another’s business, that attitude naturally creates friction.
Charles’ performance works because Martin isn’t portrayed as simply an unpleasant doctor. His character has moments of humor, vulnerability, frustration, and emotional restraint. The actor has to make those different sides believable while keeping Martin’s professional competence at the center of the story.
Charles is perhaps best known to television audiences for playing Will Gardner on The Good Wife. His television, film, and stage experience also includes Sports Night and other productions. His previous experience across comedy and drama helps him handle the unusual balance that Best Medicine demands.
Abigail Spencer As Louisa Gavin
Abigail Spencer plays Louisa Gavin, the local schoolteacher who becomes one of the most significant people in Martin’s personal life. Unlike Martin, Louisa already understands Port Wenn and the people who live there. She knows how the community works and is far more comfortable navigating its social side.
That difference shapes their relationship from the beginning. Louisa isn’t impressed simply because Martin is an accomplished doctor. She can appreciate his abilities while still questioning his behavior, and she’s willing to tell him when she thinks he’s gone too far.
Their connection isn’t limited to romance, either. Louisa has her own career, history, and place within Port Wenn. Her previous relationship with Sheriff Mark Mylow adds another complication, particularly as Martin becomes more involved in her life.
Spencer has built an extensive television résumé, with credits including Rectify, Mad Men, Timeless, Suits, True Detective, and Grey’s Anatomy. That experience with character-driven television gives Louisa a strong presence within the ensemble.
Josh Segarra As Sheriff Mark Mylow
Josh Segarra plays Sheriff Mark Mylow, one of the most familiar and socially connected figures in Port Wenn. His position as sheriff naturally puts him in the middle of local problems, but his personal relationships are just as important to his role in the series.
Mark knows how to talk to people and understands the town’s personalities. That’s a sharp contrast with Martin, who often struggles with even basic social interaction. Their differences make Mark a useful counterpoint to the show’s central doctor.
Mark’s history with Louisa adds another layer. The two were previously engaged, meaning that Mark remains part of Louisa’s personal history even as her relationship with Martin develops. Still, he’s more than a romantic complication. His role as sheriff gives him an independent place within the Port Wenn community.
Segarra is known for television work that includes Abbott Elementary and Sirens. His experience with comedy and character-based storytelling suits Mark’s approachable personality.
Annie Potts As Aunt Sarah
Annie Potts plays Aunt Sarah, Martin’s aunt and one of his strongest connections to his younger years. Because Martin spent summers in Port Wenn as a child, his return isn’t quite the fresh start it might appear to be. Sarah remembers that earlier part of his life.
That history gives her a special position. She knows Martin as a family member rather than simply as the town doctor. As a result, she’s able to understand aspects of his personality that other residents may not see.
At the same time, Sarah isn’t there simply to defend him. She can challenge Martin when his behavior becomes unacceptable, giving their relationship a useful balance of affection and honesty.
Potts has spent decades working in television and film. Her best-known credits include Designing Women, Young Sheldon, and the Ghostbusters films. Her experience with both comedy and emotional material makes her a natural fit for the show’s mixture of humor, family history, and drama.
Cree As Elaine Denton
Cree plays Elaine Denton, Martin’s assistant at the medical practice. Because she works alongside him every day, she sees a side of Martin that patients and other residents don’t always experience.
Elaine also has plenty going on in her own life. Fox describes her as energetic and ambitious, with dreams of eventually leaving Port Wenn and becoming a YouTube star. Her lack of competence in some areas can test Martin’s patience, which gives their workplace relationship an additional comic edge.
That makes Elaine more than an administrative character. She has her own goals and personality, and her storyline gives the medical practice another source of humor.
Cree’s previous credits include Turtles All the Way Down, Big Sky, And Just Like That, and Mr. Iglesias. Her role in Best Medicine gives her another opportunity to combine comedy with character-focused storytelling.
Greg And George Bring Port Wenn To Life
Stephen Spinella plays Greg Garrison, while Jason Veasey plays George Brady. The married couple are part of the social fabric of Port Wenn and are associated with The Salty Breeze, a local gathering place.
That setting serves an important purpose. Medical stories can easily become confined to a doctor’s office or examination room, but Best Medicine regularly takes its characters into the wider community. Places such as The Salty Breeze give residents somewhere to meet, talk, argue, and share the latest local developments.
Greg and George have also become more prominent as the series has progressed. For Season 2, Spinella and Veasey were promoted to series regulars, signaling a larger role for the characters in the continuing story.
Their increased presence reflects one of the show’s broader developments: Port Wenn itself is becoming an increasingly important part of the story.
Geneva Potter, Sally Mylow And The Wider Cast
Didi Conn plays Councilwoman Geneva Potter, bringing local government into the ensemble. In a small community like Port Wenn, civic matters can quickly become personal, making Geneva useful for stories involving town decisions, events, and disagreements.
Clea Lewis plays Sally Mylow, the town’s pharmacist. Her profession naturally connects her with the medical side of the series, while her place in the community gives her opportunities to appear in storylines beyond Martin’s practice.
One point worth keeping clear is Sally’s surname. She shares the Mylow name with Sheriff Mark Mylow, but that alone isn’t enough to establish a particular family relationship. Unless the series confirms one, it’s better to treat the two as separate characters rather than make an assumption based solely on their names.
John DiMaggio plays Bert Large, while Carter Shimp plays Bert’s son, Al Large. Their father-and-son relationship gives Port Wenn another family unit and helps broaden the show’s community-focused storytelling.
DiMaggio is especially recognizable for his voice work. He is widely known as Bender in Futurama and Jake in Adventure Time. Best Medicine, however, allows audiences to see him in a live-action role.
Cindy De La Cruz plays Jeannie, another schoolteacher in Port Wenn. Although she shares a profession with Louisa, the two are separate characters. Jeannie’s presence expands the school’s place in the wider community and helps show that Port Wenn’s social world extends beyond Martin’s medical practice.
Copernicus And The Softer Side Of Martin
Wattson plays Copernicus, the stray dog who becomes attached to Martin. The character might seem like a small comic addition, but Copernicus actually fits one of the show’s recurring ideas: Martin may want distance from other people, but Port Wenn keeps finding ways to draw him into relationships.
The dog doesn’t care about Martin’s medical reputation or his difficult personality. That makes Copernicus an uncomplicated source of companionship and affection.
Copernicus also gives viewers an opportunity to see Martin from a softer perspective. Around patients and neighbors, the doctor can appear cold or impatient. His interactions with the dog provide moments where that emotional distance becomes less pronounced.
In a series built around an emotionally guarded protagonist, even a simple relationship with a dog can reveal something about the character.
Martin Clunes As Dr. Robert Best
Martin Clunes occupies a unique position in the Cast of Best Medicine. He plays Dr. Robert Best, Martin’s father, but longtime fans will recognize Clunes from his starring role as Dr. Martin Ellingham in the original British Doc Martin.
That casting creates an obvious connection between the two productions without requiring Clunes to reprise his original character. Instead, he becomes part of the American series’ own story as Martin Best’s father.
Clunes first appeared during Season 1 in the episode “Doc Martin.” Fox’s promotional material highlighted the unusual casting choice and the connection to the British original.
Robert’s role also serves a story purpose. As Martin’s father, he provides the series with an opportunity to explore the family background of its central character. Viewers can learn more about Martin through his relationship with someone who knew him long before he became Port Wenn’s doctor.
Clunes returned as Robert Best for Season 2. His continued presence gives the family storyline more room to develop.
How The Best Medicine Characters Connect
One of the reasons the Best Medicine Characters are effective as an ensemble is that their stories overlap naturally. Martin’s job puts him in contact with much of Port Wenn, while his personal relationships connect him to several of the town’s central figures.
Louisa is one of his most important personal connections, while Mark’s past with Louisa gives him another reason to remain part of Martin’s story. Aunt Sarah connects Martin to his childhood, and Elaine is present during his everyday working life.
Greg and George provide a social gathering point through The Salty Breeze. Geneva represents the civic side of the town, Sally connects the community to pharmacy and healthcare, and Bert, Al, and Jeannie add further family, professional, and educational connections.
This overlapping structure allows Best Medicine to operate as more than a weekly medical show. A patient may bring Martin a medical problem in one episode, but the consequences can spill into his relationships with the people around him.
The medical cases give the series its immediate storylines. The characters are what create continuity.
Is Best Medicine Based On Doc Martin?
Yes. Best Medicine is based on the British Doc Martin format, which Fox describes as an internationally successful source for the American adaptation.
The central idea is familiar to viewers of the original. A highly skilled doctor with a difficult personality ends up practicing medicine in a small coastal community, where his professional abilities don’t necessarily make his personal interactions any easier.
Fox’s version moves the story to Port Wenn, Maine, and gives the characters an American setting and identity. Josh Charles plays Dr. Martin Best, while Abigail Spencer plays Louisa Gavin, rather than simply reproducing the original characters exactly.
Martin Clunes’ involvement provides the most obvious connection between the two productions. Yet his role is deliberately different. In Best Medicine, he plays Martin Best’s father rather than Dr. Martin Ellingham.
The distinction matters because the Fox series is designed to stand on its own. Viewers who know Doc Martin will recognize the inspiration, but new viewers don’t need to know the British series to understand Martin Best and his world.
The Fox production is its own take on the Doc Martin concept, rather than a direct scene-for-scene reproduction.
Best Medicine Season 2 In 2026
Season 2 of Best Medicine premiered on September 22, 2026, on Fox. The network announced the date as part of its 2026–27 schedule and reported that the show’s first-season debut reached 16 million multiplatform viewers.
The second season doesn’t simply reset the story. It moves forward from the first-season events and gives several established characters more room to develop.
Martin’s professional problems remain important. His blood phobia becomes a significant issue, and the situation surrounding his medical duties leads to additional oversight. A new monitor named Parker, played by Jack Cutmore-Scott, is brought in to oversee Martin’s compliance.
His personal life is complicated as well. Eden, played by Eliza Coupe, returns, while Louisa’s relationship with Mark and her own decisions create further developments.
The supporting ensemble is also expanding. Greg and George have become series regulars, Martin Clunes returns as Robert Best, and Andrea Martin joins Season 2 as Judith.
Taken together, those changes show how the series continues to broaden its focus. Martin remains the central character, but Port Wenn’s residents increasingly have stories of their own.
Why The Cast Works So Well
The appeal of the Best Medicine Cast comes from the differences between its characters. Josh Charles gives Martin a serious center, but the series surrounds him with people who approach life in very different ways.
Louisa is emotionally perceptive and willing to confront Martin. Mark is more naturally comfortable within the community. Sarah knows Martin through family history, while Elaine brings a younger, more ambitious energy to the medical practice.
Then there are the residents who make Port Wenn feel like a real place. Greg and George create a social hub, Geneva represents local government, Sally works within healthcare, and Bert, Al, and Jeannie give the town additional family and professional connections. Even Copernicus contributes to the emotional texture of Martin’s story.
That variety keeps the series from becoming dependent on Martin alone. His medical cases provide the immediate drama, but the ensemble gives viewers reasons to care about what happens to him outside the examination room.
For Martin in particular, that’s crucial. He can solve a difficult medical problem with confidence, but dealing with people requires something different. The cast continually puts him in situations where he has to communicate, adapt, and confront the relationships he’s spent much of his life avoiding.
Final Thoughts
The Cast of Best Medicine gives Fox’s medical dramedy much of its warmth, humor, and personality. Josh Charles may be at the center as Dr. Martin Best, but the series works because Port Wenn is populated by characters with their own relationships, careers, histories, and problems.
Abigail Spencer’s Louisa gives Martin an important emotional connection, while Josh Segarra’s Mark links personal history with the wider community. Annie Potts’ Aunt Sarah provides a connection to Martin’s childhood, and Cree’s Elaine adds both workplace conflict and comic energy.
The wider cast matters just as much. Greg and George help establish Port Wenn’s social life, Geneva brings in local government, Sally connects the story to pharmacy, and Bert, Al, and Jeannie make the town feel larger than Martin’s immediate circle. Copernicus, meanwhile, offers one of the show’s simplest examples of Martin forming a connection he didn’t plan to make.
Martin Clunes adds another layer through his role as Robert Best. Because of his history as the original Doc Martin, his appearance gives longtime fans a familiar face while still allowing Best Medicine to develop its own American identity.
With Season 2 now airing in 2026, the ensemble is becoming even more significant. Greg and George have larger roles, Clunes has returned, and new characters are adding fresh complications to Martin’s professional and personal life.
At its heart, Best Medicine is about more than a talented doctor treating patients. It’s about what happens when someone who prefers isolation is placed in a community where people keep showing up, asking questions, and becoming part of his life. The cast is what makes that idea work from episode to episode.
FAQs About The Cast Of Best Medicine
Who Plays Dr. Martin Best?
Josh Charles plays Dr. Martin Best. Martin is a highly accomplished surgeon who leaves his career in Boston and becomes the general practitioner in Port Wenn, Maine. Although he has exceptional medical skills, his blunt communication style regularly creates difficult situations with patients and other residents.
Who Plays Louisa In Best Medicine?
Abigail Spencer plays Louisa Gavin, a schoolteacher in Port Wenn who becomes closely connected to Martin. She understands the town and its residents well and isn’t afraid to challenge Martin when his behavior goes too far. Her previous relationship with Sheriff Mark Mylow also adds another layer to her storyline.
Who Plays Mark Mylow?
Josh Segarra plays Sheriff Mark Mylow. Mark is an established member of the Port Wenn community whose work as sheriff puts him in contact with local residents and their problems. His previous relationship with Louisa also connects him to Martin’s personal storyline.
Who Plays Aunt Sarah?
Annie Potts plays Aunt Sarah, Martin’s aunt and an important link to his childhood in Port Wenn. Because of their family relationship, Sarah knows Martin beyond his role as a doctor and can challenge him in ways that other residents may not.
Is Martin Clunes In Best Medicine?
Yes. Martin Clunes plays Dr. Robert Best, Martin Best’s father. Clunes previously starred as Dr. Martin Ellingham in the original British Doc Martin, which inspired the Fox series. His role in Best Medicine is different, making him part of the American show’s own story. He returned for Season 2.
Who Plays Greg And George?
Stephen Spinella plays Greg Garrison, while Jason Veasey plays George Brady. They are a married couple connected to The Salty Breeze, one of Port Wenn’s local gathering places. Both actors received expanded roles as series regulars for Season 2.
Is Best Medicine Based On Doc Martin?
Yes. Best Medicine is an American adaptation of the British Doc Martin format. The Fox series keeps the basic premise of a highly skilled but socially difficult doctor working in a small coastal community while creating its own setting, characters, and storylines.
When Did Best Medicine Season 2 Premiere?
Season 2 of Best Medicine premiered on September 22, 2026, on Fox. The new season continues Martin’s medical and personal storylines while expanding the roles of several Port Wenn residents and introducing additional characters.
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