The Best Medicine cast is led by Josh Charles, Abigail Spencer, Annie Potts, Josh Segarra and Cree, who bring the fictional seaside town of Port Wenn to life. The FOX comedy-drama follows a brilliant but socially difficult doctor who leaves Boston for a small fishing village, only to discover that treating illnesses may be easier than dealing with the people around him. You can explore the series on the official Best Medicine page. FOX has already renewed the show for Season 2, which premieres on September 22, 2026.
The setup may sound like a traditional medical drama, but Best Medicine is much lighter.
There are strange patients, small-town arguments, romance, family trouble and plenty of moments where Dr. Martin Best wishes everyone would simply leave him alone.
Of course, nobody does.
So who plays Martin? Who is Louisa? And which familiar actors make up the rest of the cast?
Here is the full guide.
Quick Facts About Best Medicine
Series: Best Medicine
Network: FOX
Genre: Medical comedy-drama
Series premiere: January 4, 2026
Season 2 premiere: September 22, 2026
Lead actor: Josh Charles
Based on: Doc Martin
Setting: Fictional East Coast fishing village
Developer/showrunner: Liz Tuccillo
Main cast: Josh Charles, Abigail Spencer, Annie Potts, Josh Segarra and Cree
FOX officially identifies those five performers as the central stars of the series.
Josh Charles as Dr. Martin Best
Josh Charles plays Dr. Martin Best, the character at the center of everything.
Martin was once a highly successful surgeon in Boston.
Then something changed.
He suddenly leaves his impressive career and becomes a general practitioner in the small fishing village where he spent summers as a child.
That sounds peaceful.
It is not.
Martin may be excellent at medicine, but he is terrible at making people feel comfortable.
He is blunt.
Impatient.
Often rude.
And very bad at pretending he enjoys small talk.
FOX describes him as a brilliant doctor whose personality quickly causes problems with the villagers.
Why Martin Best Is Such a Fun Character
Martin is funny because he often does not realize how funny he is.
Someone may be upset.
Martin gives them a medically correct answer.
They want comfort.
Martin gives them facts.
They want patience.
Martin wants them out of his office.
That difference creates much of the show’s humor.
At the same time, Martin is not simply rude for no reason.
His difficult personality hides deeper emotional problems and a new phobia that has affected his life and career.
That gives the character more depth.
He can make viewers laugh in one scene and feel sorry for him in the next.
Where You Know Josh Charles From
Josh Charles has had a long television and film career.
Many viewers know him best as Will Gardner from The Good Wife.
That role earned him major awards attention and made him one of the show’s most popular characters.
He has also appeared in projects including Dead Poets Society, Sports Night, We Own This City and many others.
In Best Medicine, Charles gets to combine drama with dry comedy.
That combination suits him well.
Martin is serious.
But the world around him is often ridiculous.
Abigail Spencer as Louisa Gavin
Abigail Spencer plays Louisa Gavin.
Louisa is a local schoolteacher and one of the most important people in Martin’s life.
She understands Port Wenn in a way Martin does not.
She knows the community.
She understands people.
And unlike Martin, she usually knows when someone needs kindness.
Naturally, the two clash.
But that is not the whole story.
There is also a strong emotional connection between them.
FOX specifically describes Louisa as the schoolteacher who quickly becomes caught in Martin’s difficult new life.
Martin and Louisa Have One of the Show’s Biggest Relationships
Martin and Louisa are almost opposites.
That is exactly why they work.
Martin is controlled.
Louisa is warmer.
Martin says whatever he thinks.
Louisa understands that words can hurt.
Martin wants distance.
Louisa keeps becoming important to him.
Their relationship develops slowly because Martin is not good at admitting what he feels.
Sometimes he seems capable of understanding complicated medical problems more easily than a basic romantic conversation.
That gives the show both comedy and heart.
Where You Know Abigail Spencer From
Abigail Spencer has appeared in many popular television shows.
Suits fans may know her as Dana Scott.
She also starred in Timeless and Rectify and has appeared in projects such as Grey’s Anatomy.
Spencer brings an important balance to Best Medicine.
Louisa has to be warm without becoming weak.
She also has to challenge Martin without turning every conversation into an argument.
Spencer makes that balance feel natural.
Annie Potts as Aunt Sarah
Annie Potts plays Aunt Sarah.
Sarah is Martin’s aunt and one of his strongest personal connections to the village.
She has known him much longer than most of the other characters.
That means she understands things about him that he would probably prefer to keep hidden.
Sarah can be supportive.
She can also tell Martin when he is acting terribly.
That makes her valuable.
Martin needs someone who cares about him but is not afraid of him.
Sarah fills that role.
FOX lists Annie Potts as one of the series’ five main cast members.
Why Annie Potts Is So Familiar
Annie Potts has been working in film and television for decades.
Many viewers know her as Janine Melnitz from the Ghostbusters movies.
Others remember her from Designing Women.
More recently, she became famous to a new generation as Meemaw in Young Sheldon.
That long career helps Aunt Sarah feel immediately comfortable on screen.
She has the energy of someone who truly belongs in the town.
Even when Martin acts like an outsider, Sarah makes Port Wenn feel connected to his past.
Josh Segarra as Mark Mylow
Josh Segarra plays Mark Mylow.
Mark is an important member of the local community and brings much more energy to scenes than Martin usually wants.
FOX officially lists Segarra among the show’s principal cast and identifies him as Mark Mylow.
Mark is more socially comfortable than Martin.
That difference makes their scenes entertaining.
Martin approaches problems with medical logic.
Mark understands how the town works.
And in a place where everyone knows everyone else, social knowledge can be almost as useful as a doctor’s training.
Where You Know Josh Segarra From
Josh Segarra has appeared in several popular shows.
He played Adrian Chase in Arrow.
He has also appeared in Abbott Elementary, The Other Two and Sirens.
Segarra often plays characters with a lot of confidence and energy.
That makes him a good contrast with Josh Charles.
Martin sometimes seems as though talking to another human being is exhausting.
Mark usually looks much happier to be involved.
Cree as Elaine Denton
Cree plays Elaine Denton.
Elaine becomes part of Martin’s professional life and adds another unpredictable personality to his already stressful new situation.
Martin would probably love an office that is silent, perfectly organized and free of unnecessary conversation.
That is not what he gets.
Elaine adds youthful energy.
She can be distracting.
She can surprise him.
And she often helps make the medical office feel less serious.
FOX includes Cree among the five main stars of Best Medicine.
Why Elaine Matters
Elaine is important because Martin cannot grow if everyone around him behaves exactly the way he wants.
Port Wenn constantly forces him to adapt.
Elaine is part of that.
She makes mistakes.
She has her own ideas.
She does not always fit Martin’s idea of the perfect medical assistant.
But Martin slowly has to learn that people are not machines.
That lesson appears throughout the series.
He knows medicine.
People are much harder.
The Five Main Best Medicine Cast Members
FOX’s current official cast listing names:
Josh Charles as Martin Best
Abigail Spencer as Louisa Gavin
Josh Segarra as Mark Mylow
Annie Potts as Aunt Sarah
Cree as Elaine Denton
These five actors also appeared together at FOX’s May 2026 FYC event in Los Angeles, further confirming them as the central ensemble heading toward Season 2.
The Supporting Cast Makes Port Wenn Feel Real
A small-town show needs more than five people.
The village must feel alive.
That means recurring characters become very important.
Some work in local businesses.
Some are connected with medicine.
Others simply create problems Martin never asked to solve.
The best small-town television shows eventually make viewers feel as though they know everyone.
Best Medicine is building that kind of world.
Even a character who appears for only a short time can add something funny or surprising.
John DiMaggio as Bert Large
John DiMaggio appears as Bert Large.
Bert is one of the colorful people who help make Port Wenn unpredictable.
Many viewers may recognize DiMaggio more by his voice than his face.
He is famous for voicing Bender in Futurama.
He is also the voice of Jake the Dog in Adventure Time.
Seeing him in a live-action role gives fans something different.
Bert fits nicely into a town filled with characters who repeatedly test Martin’s patience.
Carter Shimp as Al Large
Carter Shimp plays Al Large.
Al is Bert’s son.
He becomes part of the younger group of characters around the town and helps expand the story beyond Martin’s medical cases.
That is important.
If every episode focused only on Martin diagnosing illnesses, the show could become repetitive.
Relationships between the villagers make Port Wenn feel bigger.
Al’s storylines help accomplish that.
Stephen Spinella and Jason Veasey
Stephen Spinella and Jason Veasey also appear among the recurring Port Wenn characters.
They help provide the kind of community atmosphere the series needs.
Characters like these may not dominate every episode.
But they make the village feel lived-in.
You begin recognizing faces.
You remember relationships.
You understand who spends time where.
Eventually, the town itself becomes almost another character.
Clea Lewis as Sally Mylow
Clea Lewis plays Sally Mylow.
Sally’s presence expands the Mylow family and creates another connection within Port Wenn.
Characters linked to health care are especially useful in a medical comedy.
Martin may be the doctor.
But he cannot be the only person involved when someone needs medicine, advice or local knowledge.
Sally helps connect those parts of town life.
Didi Conn as Geneva Potter
Didi Conn appears as Geneva Potter.
Longtime movie fans may recognize Conn immediately.
She is famous for playing Frenchy in Grease.
Her appearance in Best Medicine adds another familiar veteran actor to the show’s world.
Geneva also represents something Martin has trouble escaping.
Local involvement.
In a small town, decisions often become everybody’s business.
Martin wants privacy.
Port Wenn does not appear interested in giving it to him.
Martin Clunes Has a Special Connection to Best Medicine
One of the smartest casting choices is Martin Clunes.
Why?
Because Best Medicine is based on the British series Doc Martin.
Clunes played the original Dr. Martin Ellingham.
That role made him closely associated with the entire concept.
Bringing him into the American adaptation creates a fun connection between the two shows.
FOX officially confirms that Best Medicine is adapted from the British Doc Martin format.
For longtime fans, seeing Clunes in the new version feels almost like the original show giving the remake its blessing.
Best Medicine Is Based on Doc Martin
The similarities are easy to see.
Both shows focus on a highly skilled doctor.
Both place him in a small coastal community.
Both give him poor people skills.
And both use the difference between brilliant medicine and terrible bedside manner for comedy.
But Best Medicine is not meant to be a scene-by-scene copy.
FOX has adapted the basic idea for an American setting.
The characters have their own stories.
The town has its own personality.
And Josh Charles is creating his own version of the difficult doctor rather than simply copying Martin Clunes.
Where Does Best Medicine Take Place?
The series takes place in a fictional East Coast fishing village.
Martin spent summers there when he was younger.
That gives him a personal connection to the place.
He is not simply a stranger arriving for a random job.
There are memories connected with the village.
Family history.
Old emotional wounds.
And people who may understand parts of Martin’s past better than he would like.
That gives the setting more meaning.
Why Port Wenn Is Perfect for Martin
Imagine Martin in a giant city.
He could go home.
Close the door.
Avoid everyone.
That would be easy.
Now place him in a tiny village.
Suddenly everyone recognizes him.
Patients see him outside work.
Local residents know where he lives.
Someone always needs something.
That is much funnier.
The town forces Martin into relationships even when he tries to escape them.
The result is the central joke of the whole show.
Martin moved somewhere smaller hoping life might become simpler.
Instead, everybody knows his business.
Best Medicine Season 1
Best Medicine premiered on January 4, 2026.
The first season introduced Martin’s move from Boston and showed him struggling to settle into Port Wenn.
Viewers watched him solve medical problems while repeatedly creating social ones.
His relationships with Louisa, Aunt Sarah, Elaine and the rest of the community slowly developed.
The show became a strong enough performer for FOX to bring it back quickly.
FOX later said the series delivered a 16-million-viewer multiplatform debut.
That strong response helped make Season 2 an important part of the network’s 2026 fall schedule.
Is Best Medicine Season 2 Happening?
Yes.
Best Medicine Season 2 is officially confirmed.
FOX has scheduled its premiere for Tuesday, September 22, 2026.
That means fans do not have much longer to wait.
The current official show information continues to list Josh Charles, Abigail Spencer, Annie Potts, Josh Segarra and Cree as the principal cast.
So the core group that made Season 1 work is staying at the center of the story.
What Could Season 2 Explore?
Martin still has plenty of problems.
His relationship with Louisa remains one of the biggest questions.
His emotional issues have not magically disappeared.
The villagers are not going to suddenly become quiet.
And Martin is definitely not going to become wonderfully friendly overnight.
That is good.
If he changed too quickly, the show would lose what makes him interesting.
Season 2 can instead let him improve in small ways.
Maybe he listens a little longer.
Maybe he understands someone before insulting them.
Maybe he becomes more connected to the village without even noticing.
Those small changes are more believable.
Why the Best Medicine Cast Works
The cast works because everybody gives Martin a different problem.
Louisa challenges his emotional side.
Sarah connects him with family.
Elaine challenges his need for control.
Mark connects him with community life.
The recurring villagers make it impossible for him to disappear.
Martin keeps wanting distance.
Everyone else keeps pulling him closer.
That creates the show’s comedy.
But it also creates its heart.
Underneath everything, Best Medicine is really about belonging.
Is Best Medicine a Serious Medical Drama?
Not really.
There are medical cases.
Martin is a real doctor inside the story.
Patients become sick.
Some situations are serious.
But the tone is much lighter than shows built around constant hospital emergencies.
This is more of a comedy-drama.
The medical stories often give Martin a reason to interact with people he would otherwise avoid.
The bigger story is about relationships.
That makes the show easier to watch for viewers who enjoy medical settings but do not want nonstop tragedy.
Is Best Medicine Worth Watching?
It depends on what you enjoy.
If you like small-town shows, there is plenty here.
If you enjoy awkward comedy, Martin provides it.
If you like slow romance, Martin and Louisa offer that too.
And if you watched Doc Martin, there is the added fun of seeing how the idea has been reworked for American television.
The cast is another big advantage.
Josh Charles, Abigail Spencer and Annie Potts are experienced actors.
Josh Segarra adds energy.
Cree gives the show a younger voice.
Together, they stop Martin’s difficult personality from making the show feel too cold.
Best Medicine Cast at a Glance
Josh Charles — Dr. Martin Best
The brilliant but blunt doctor who moves from Boston to Port Wenn.
Abigail Spencer — Louisa Gavin
A schoolteacher who becomes one of Martin’s closest emotional connections.
Annie Potts — Aunt Sarah
Martin’s aunt and a strong link to his family and childhood.
Josh Segarra — Mark Mylow
An energetic local figure who becomes part of Martin’s new community.
Cree — Elaine Denton
A key member of Martin’s medical-office world who frequently tests his patience.
FOX’s official Season 2 page continues to feature all five as the main cast.
Interesting Facts About Best Medicine
The series is based on the British hit Doc Martin.
Josh Charles leads the American version as Martin Best.
Abigail Spencer plays Louisa Gavin.
Annie Potts plays Aunt Sarah.
Josh Segarra plays Mark Mylow.
Cree plays Elaine Denton.
The series premiered in January 2026.
Season 2 premieres September 22, 2026.
FOX reported a 16-million multiplatform viewer debut.
And the main cast appeared together at a special FOX event in May 2026.
Final Thoughts
The Best Medicine cast is one of the biggest reasons the show works.
Josh Charles gives Dr. Martin Best enough intelligence to seem believable as a brilliant surgeon and enough awkwardness to make ordinary conversations funny.
Abigail Spencer gives Louisa warmth and strength.
Annie Potts makes Aunt Sarah feel like someone Martin genuinely needs.
Josh Segarra brings energy.
Cree helps turn the doctor’s office into a place where Martin can never have the quiet life he wants.
Then the supporting cast builds a wider village around them.
That matters because Best Medicine is not really just about a doctor.
It is about a man who thinks he wants to be left alone slowly discovering that people may be exactly what he needs.
He can diagnose illnesses quickly.
Understanding himself will take much longer.
And with Season 2 premiering September 22, 2026, there is still plenty of time for Port Wenn to keep working on him.
FAQs
Who is in the Best Medicine cast?
The main cast includes Josh Charles, Abigail Spencer, Annie Potts, Josh Segarra and Cree.
Who plays Dr. Martin Best?
Josh Charles plays Dr. Martin Best.
Who plays Louisa in Best Medicine?
Abigail Spencer plays Louisa Gavin.
Who plays Aunt Sarah?
Annie Potts plays Aunt Sarah.
Who plays Mark Mylow?
Josh Segarra plays Mark Mylow.
Who plays Elaine Denton?
Cree plays Elaine Denton.
Is Best Medicine based on another television show?
Yes. It is based on the British comedy-drama Doc Martin.
When did Best Medicine premiere?
The series premiered on January 4, 2026.
Is Best Medicine Season 2 confirmed?
Yes. FOX officially renewed the series.
When does Best Medicine Season 2 premiere?
Season 2 premieres on Tuesday, September 22, 2026.
Are the main cast members returning for Season 2?
FOX’s current official information continues to list Josh Charles, Abigail Spencer, Annie Potts, Josh Segarra and Cree as the show’s main cast.
What kind of show is Best Medicine?
It is a one-hour medical comedy-drama combining medical cases, small-town stories, romance and family relationships.
Where can viewers watch Best Medicine?
The series airs through FOX in the United States, with viewing options depending on location and service.
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