Disillusioned, Martin decides he has made a mistake and plans to return to London.
Martin's surgery officially opens for business, but patients continue to treat it as a drop-in cafe.
Louisa's old flame, Danny Steel, comes to Portwenn hoping to rekindle their romance.
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Although pleased to renew his acquaintance with his Auntie Joan with whom he spent holidays as a boy, he is less than enamoured of the other locals he encounters and the state of his predecessor's surgery.
He also inadvertently uncovers an affair between a teenager and the wife of the Lieutenant Colonel, leading to threats of a divorce, a reconciliation and then a punch on his nose.
The show is set in the fictional seaside village of Portwenn and filmed on location in the village of Port Isaac, Cornwall, England, with most interior scenes shot in a converted local barn.
Doc Martin has aired on ITV since 2 September 2004, with a first season of six episodes.
Louisa buys two tickets to the Portwenn Players Dance and invites Martin.
He doesn't want to go so Louisa offers the ticket to Mark instead.
Former teacher Roger Fenn is hoarse and has a lump on his neck, so Martin refers him to a specialist for a biopsy.
He is diagnosed with cancer and must have surgery which may cost the former singer his voice.
Louisa interviews for a position as headmistress and crosses Martin by insisting that children with a highly contagious disease should still come to school against the doctor's wishes.