John Marquez

There's something wrong with PC Penhale's older brother, Sam. Elsewhere, Bert Large gives romantic advice to his son, Al, which only makes things worse with Pauline. And at a dinner to discuss her medical research, Edith kisses Martin.

Threatened by loan sharks, Bert Large can't afford to host a charity event for a cat sanctuary. PC Penhale intervenes, and Eleanor comes up with a way to bring more customers to Bert's restaurant. Meanwhile, Martin makes plans to leave Portwenn in a week.

It's Doc Martin's last day in Portwenn, and his office is packed with patients. Edith turns up, expecting an apology, and Aunt Joan rebukes Martin as well. Louisa is in a car accident that causes Martin to doubt his decision.

Louisa ends her relationship with Martin, but when she needs him to treat her injured friend, he gets a chance to redeem himself.

A new police officer, who has narcolepsy, replaces Mark Mylow; Martin treats a girl who's been taking her mother's diet pills.

Louisa Glasson finds out she has a rival for Doc Martin's affections; Martin accidentally runs over a dog.