Katey Sagal Joins Best Medicine as Louisa's Scheming Mom
The actress will recur as Kathleen Gavin, a character described as combative and self-interested, causing chaos for Louisa.
In a significant addition to the cast of *Best Medicine*, Katey Sagal has been confirmed to recur as Louisa's estranged mother, Kathleen Gavin, bringing a new layer of complexity to the show's dynamics 123. Known for her sharp wit and formidable presence, Sagal’s portrayal promises to inject a fresh dose of drama into the coastal village where the series is set.
Kathleen Gavin is described as combative, conniving, and self-interested, traits that reportedly make her a formidable figure in the lives of those around her, particularly her daughter Louisa 123. Her return to the town is expected to cause considerable upheaval, stirring up old tensions and introducing new challenges for Louisa to navigate 123.
Sagal’s involvement in *Best Medicine* marks another notable chapter in her illustrious career, which includes a Golden Globe win for her role in *Sons of Anarchy* 23. With a diverse range of projects under her belt, including films such as *Trust* and *Pitch Perfect 2*, as well as television shows like *Married...With Children* and *Futurama*, Sagal brings a wealth of experience to the role of Kathleen Gavin 2.
The character of Kathleen Gavin is also known by the nickname 'Shady Katie' among the townspeople, though this detail is contested by some sources 12 — contradicting information suggests that this moniker may not be used in the series 3.
*Best Medicine* is a one-hour comedy series based on the British show *Doc Martin*, following the story of Dr. Martin Best, a former Boston surgeon who now practices as a general practitioner in a quaint coastal village 1. Dr. Best is known for his blunt and sometimes rude demeanor towards his patients, creating a unique dynamic with the local community 1.
Louisa Glasson, a local schoolteacher, finds herself at odds with Dr. Best, adding another layer of intrigue to the show’s interpersonal relationships 1. The series is owned by Fox Entertainment and produced by Fox Entertainment Studios, with a team of executive producers including Ben Silverman, Rodney Ferrell, and Liz Tuccillo, who serves as showrunner 1.
Katey Sagal’s appearances in *Best Medicine* are set to begin in episodes airing later in the current season, ensuring that viewers will have plenty to look forward to as the storyline unfolds 23.
What We Know
- Katey Sagal will recur in *Best Medicine* for Season 2 123
- Her character is named Kathleen Gavin 123
- Kathleen Gavin is estranged from her daughter Louisa 123
- Kathleen Gavin is described as combative, conniving, and self-interested 123
- Kathleen Gavin’s return causes chaos for Louisa 123
- Katey Sagal’s appearances will start in later episodes of the current season 23
- Katey Sagal won a Golden Globe for her role in *Sons of Anarchy* 23
- The series is based on *Doc Martin* 1
- Katey Sagal has a diverse range of acting credits 2
- The series is owned by Fox Entertainment and produced by Fox Entertainment Studios 1
What Remains Unclear
Verification report
Likely accurate — probability of truth 78%, weighted across 24 claims from 3 independent outlets.
- confirmed Katey Sagal will recur in Best Medicine for Season 2. (93%)
- confirmed Katey Sagal's character is named Kathleen Gavin. (93%)
- confirmed Kathleen Gavin is estranged from her daughter Louisa. (93%)
- confirmed Kathleen Gavin is described as combative, conniving, and self-interested. (93%)
- confirmed Kathleen Gavin's return to town causes chaos for Louisa. (93%)
- likely Katey Sagal's appearances in Best Medicine will begin in episodes airing later in the current season. (84%)
- likely Katey Sagal won a Golden Globe for her role in Sons of Anarchy. (84%)
- likely Kathleen Gavin is referred to as 'Shady Katie' by the townspeople. (73%)
- likely Best Medicine is based on the British series Doc Martin. (71%)
- likely Best Medicine is a one-hour comedy series. (71%)
- likely Martin Best is a former Boston surgeon now working as a general practitioner in a coastal village. (71%)
- likely Martin Best has a blunt and sometimes rude manner with patients. (71%)
- likely Louisa Glasson is a local school teacher who has a difficult relationship with Martin Best. (71%)
- likely The series is owned by Fox Entertainment and produced by Fox Entertainment Studios. (71%)
- likely Ben Silverman, Rodney Ferrell, Howard T. Owens, Liz Tuccillo, Mark Crowdy, Philippa Braithwaite, Jay Karas, and Josh Charles are executive producers. (71%)
- likely Liz Tuccillo serves as showrunner. (71%)
- likely Katey Sagal has previously worked on Fox shows such as Married...With Children and Futurama. (71%)
- likely Katey Sagal's recent acting roles include One Piece, The Abandons, The Conners, and Rebel. (71%)
- likely Katey Sagal's upcoming project is an Apple TV comedy called She's Fine. (71%)
- likely Katey Sagal has appeared in films like Trust, Bleed for This, Pitch Perfect 2, and The Good Mother. (71%)
- likely Katey Sagal has released two albums titled Well and Room. (71%)
- likely Katey Sagal wrote a book titled Grace Notes: My Recollections published in 2017. (71%)
- likely Katey Sagal is represented by CAA and B&B Management. (71%)
- likely Other guest stars in Best Medicine Season 2 include Martin Clunes, Jack Cutmore-Scott, and Andrea Martin. (68%)
Sources
- Deadline — Katey Sagal To Recur On ‘Best Medicine’ For Season 2
https://deadline.com/2026/11/katey-sagal-cast-best-medicine-season-2-1237211415/ - Variety — Katey Sagal Returns to Fox in a Recurring Role on ‘Best Medicine’
https://variety.com/2026/tv/news/katey-sagal-best-medicine-recurring-role-fox-1236937709/ - TVLine — Best Medicine Cast Katey Sagal As Louisa's Scheming Mom — Get Details
https://www.tvline.com/2304281/best-medicine-katey-sagal-season-2-cast-louisa-mother-kathleen/