Martin Clunes

Sutton directs his team to prioritize the search for a white van, which he believes will lead them to the killer, but morale dwindles when the hunt proves daunting. Sutton's obsession with the case puts strain on his relationship with his wife when he decides to cancel on a family trip at the last minute.

The Tiwi Islands of Bathurst and Melville take pride in their ancient customs, and Martin gets a firsthand look at island Aboriginal culture. Then Martin swims at the great Ningaloo Reef while exploring the cluster of islands known as the "Magical Muirons" and visits Carnac Island, home to hundreds of venomous tiger snakes.

On Mundoo Island, Martin spends a day cattle herding; then he heads to Phillip Island, which boasts one of Australia's greatest conservation success stories, despite being a popular tourist destination. Martin also visits Maria Island and works with scientists to learn about the disease threatening Australia's iconic Tasmanian devil.

Martin begins his journey in Hawaii, the only US state made up entirely of islands. After leaving tourist-filled Oahu, he explores the active volcanoes of the Big Island, the largest island in all US territory, and the ancient traditions of Molokai Island. Next, Martin heads 2,500 miles north to Kodiak Island in Alaska, where there is one bear per square mile.

Martin enjoys salsa dancing lessons and rum tasting in Puerto Rico before heading to the Sea Islands off the coast of Georgia, where the inhabitants attempt to preserve the traditional practices of African slaves. On the Outer Banks of North Carolina, Martin learns about the mysterious lost colony of Roanoke, before traveling to Chincoteague, Virginia, to watch the world-famous wild pony swim.

A stomach bug sweeps through Portwenn. Martin creates mass panic by declaring it's the swimming pool, and then infuriates the locals by blaming the village water supply. Meanwhile, plumber Bert Large is making a mint off his new business: bottled water.

Louisa insists she doesn't want Martin involved in her life, and he agrees. Later, she schedules a medical check-up and makes an awkward discovery: Edith will be her new doctor.

(Aired in US as The Apple Doesn't Fall) Louisa faints in front of her class, Aunt Joan nearly runs someone over with her car, and Portwenn's new policeman is falling asleep on the job.

(Aired in the US as "Movement") Taking Doc Martin's advice to "make some life changes," Bert Large abandons plumbing and opens a restaurant. Soon Portwenn is plagued by an outbreak of food poisoning.

Martin fires his receptionist and informs the locals that they can no longer use his waiting room as a social center. In return, the villagers shun him, the cafe won't serve him, and patients cancel their appointments.