Best Medicine Netflix Cast and Character Guide: Who Plays Martin Best?

The Best Medicine Netflix cast is led by Josh Charles as Martin Best, a gifted Boston surgeon whose life changes when he leaves a prestigious career and becomes the only general practitioner in a small coastal community in Maine. Abigail Spencer plays teacher Louisa Gavin, Annie Potts is Martin’s Aunt Sarah, Josh Segarra is Sheriff Mark Mylow and Cree plays Elaine Denton, the doctor’s energetic office assistant.

Best Medicine is not a Netflix original. FOX launched the American dramedy in January 2026, and Netflix added Season 1 on August 4, 2026. The distinction is useful because viewers searching after seeing the show on Netflix may assume it was developed by the streamer. It is a FOX Entertainment Studios production based on the British series Doc Martin, with Netflix serving as an additional streaming home in markets where it is licensed.

The series combines a medical case-of-the-week structure with small-town comedy, romantic tension and an ongoing story about a doctor whose blunt behavior masks a serious phobia and difficulty with emotional intimacy. Fans comparing ensemble workplace shows can also visit our Scrubs 2026 cast guide and The Four Seasons Netflix cast.

Josh Charles as Martin Best

Josh Charles plays Martin Best, the difficult doctor at the center of the series. Martin is introduced as a highly accomplished surgeon in Boston. A debilitating response to blood forces him away from the operating room, and he relocates to the Maine fishing village where he spent childhood summers. His technical confidence survives the career change, but his communication style immediately creates friction.

Charles is known for Will Gardner in The Good Wife, Dan Rydell in Sports Night and Knox Overstreet in Dead Poets Society. Those roles make him a strong fit for a character who can be intelligent, controlled and emotionally guarded at the same time. Martin’s comedy comes less from telling jokes than from reacting with ruthless honesty to people who expect warmth from their doctor.

The medical premise creates two parallel questions. Can Martin diagnose and treat a community that continually invades his personal space? And can he acknowledge the fear and psychological issues behind his isolation? The show needs Charles to make Martin frustrating without making him impossible to follow, and the actor’s dry delivery provides that balance.

Abigail Spencer as Louisa Gavin

Abigail Spencer plays Louisa Gavin, a local schoolteacher and one of the first people willing to challenge Martin directly. The official FOX description says his bedside manner rubs her the wrong way, setting up a relationship built on disagreement, curiosity and attraction. Louisa understands the rhythms of village life in a way Martin does not, so she often becomes the audience’s bridge to the community.

Spencer is recognizable from Suits, Timeless, Rectify and Grey’s Anatomy. She brings warmth without turning Louisa into a passive romantic interest. The character has her own work, social standing and judgment, and the series can use her to test whether Martin is capable of listening rather than merely being correct.

Annie Potts as Aunt Sarah

Annie Potts plays Aunt Sarah, Martin’s family anchor in the village. Sarah is practical, direct and more emotionally perceptive than her nephew. She can welcome Martin home while refusing to excuse his behavior, which makes her essential to both the comedy and the character drama.

Potts has decades of familiar screen work, including Ghostbusters, Designing Women, Toy Story and Young Sheldon. Her ability to shift from sharp humor to affection suits a character who knows the community’s history and Martin’s vulnerabilities. Aunt Sarah also prevents his relocation from feeling random: he has a real family connection to the place, even when he acts as if he wants no connection at all.

Josh Segarra as Sheriff Mark Mylow

Josh Segarra appears as Sheriff Mark Mylow. FOX describes Mark as a principal cast member, and the early premise positions him as one of the village personalities Martin cannot avoid. A small community’s sheriff is part public official, part problem-solver and part neighbor, all roles that conflict with Martin’s desire for clean boundaries.

Segarra is known for Arrow, The Other Two, Sirens and Abbott Elementary. His energetic screen presence gives Mark a natural contrast with Martin’s rigidity. Mark is also connected to pharmacist Sally Mylow, played by Clea Lewis, expanding the show’s network of family and workplace relationships.

Cree as Elaine Denton

Cree plays Elaine Denton, Martin’s office assistant. Elaine is ambitious, social and comfortable with the informal style of village life. Martin expects an efficient medical office; Elaine brings her own priorities and personality. Their mismatch turns routine administration into a recurring source of conflict.

The actor, credited professionally as Cree, is also known as Cree Cicchino from Game Shakers, Mr. Iglesias and Big Sky. Elaine’s contemporary, online-aware energy can keep the series from becoming too nostalgic, while her competence and loyalty give her more purpose than simply annoying the doctor.

The recurring Best Medicine cast

Didi Conn plays councilwoman Geneva Potter, and Clea Lewis plays pharmacist Sally Mylow. Stephen Spinella and Jason Veasey appear as Greg Garrison and George Brady, the married proprietors of The Salty Breeze. Cindy De La Cruz plays Jeannie, another schoolteacher. These characters help create the sense that Martin has entered a community where everyone knows everyone else’s business.

Voice actor John DiMaggio appears in live action as handyman Bert Large, with Carter Shimp as Bert’s son Al. The stray dog Copernicus is played by Wattson. Martin Clunes, the star of the original British Doc Martin, makes a special guest appearance as Dr. Robert Best, Martin’s father. That casting creates a deliberate connection between the adaptation and its source without requiring the two shows to share continuity.

Viewers who enjoy character networks built around a town rather than a single workplace may also like our guide to Sullivan’s Crossing. For another long-running procedural with important ensemble changes, see the latest Law & Order cast changes.

How Best Medicine changes Doc Martin

Best Medicine uses the format of Doc Martin rather than remaking every detail. The central idea remains a brilliant surgeon forced into general practice in a picturesque village, where a blood-related phobia and poor social skills complicate his new life. Names such as Martin, Louisa, Bert and Al also signal the connection.

The American version relocates the action to an East Coast fishing village and builds a cast intended to reflect its own community. FOX describes the series as a one-hour dramedy, which gives medical stories and personal relationships more room than a half-hour sitcom. Martin Clunes’ guest role functions as a playful acknowledgement of the original while Josh Charles establishes a separate interpretation.

It is better to approach Best Medicine as an adaptation with its own tone than as a scene-for-scene comparison. The key measure is whether the village feels lived-in and whether Martin’s growth emerges from relationships rather than a sudden personality change.

Where and when to watch Best Medicine

Season 1 premiered on FOX with a special advance episode on January 4, 2026, before moving to its regular Tuesday schedule. Netflix lists the series as a 2026 TV-14 comedy and added Season 1 on August 4. Streaming rights can vary, so the platform available to a viewer will depend on country and subscription.

Because the Netflix page emphasizes comedy, viewers should still expect medical drama and emotional material. Martin’s phobia, patient cases and family history provide the serious side of the show. Anyone looking for a more intense emergency-service ensemble can compare our 9-1-1 cast guide.