Uneasy Lies the Head

Season 3, Episode 8:

News of Martin and Louisa's engagement spreads like wildfire -- like the outbreak of a respiratory infection in the village. Bert Large's ill health is not his only problem as he struggles to keep his restaurant afloat.

Life in the beautiful Cornish village of Portwenn has become ever more infuriating for Dr. Martin Ellingham since the heart-wrenching decision to call off his marriage to local headmistress Louisa. Louisa has left, and Martin has begun to question what keeps him in Cornwall. It's certainly not his relentlessly annoying patients. On a visit to the hospital, Martin is stunned to meet Edith, his old girlfriend from medical school days who is now a top-ranking doctor with a flourishing private practice.

Season 4, Episode 2

Doc Martin struggles to deal with the news of Louisa's pregnancy and is conflicted over what action to take. But Louisa is adamant that she doesn't want Martin involved. Doc's aunt Joan, however, insists that she help Louisa through the pregnancy.

Louisa accepts a job back at Portwenn Primary School, where the principal is causing public concern over his increasingly erratic behavior. Martin realizes the headmaster is unwell based on his blue urine sample. Things take a frightening turn when he takes a class of students to the beach.

Season 4, Episode 3

Doc Martin is shocked to find Louisa and aunt Joan knocking at his door hours before his office has opened. Louisa has had a medical scare and wants Martin's reassurance that everything is fine with the pregnancy.

P.C. Penhale, still officially the world's worst policeman, gets an unexpected visit from his older brother Sam. Martin notices that Sam has some problems with memory and coordination, and realizes that there's a slight possibility that he has a rare genetic disease.