John Marquez

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

Unhappy with his lot in life, Bert Large abandons his plumbing business to start his own restaurant, but the eatery's opening is followed immediately by several cases of food poisoning.

Louisa's new neighbors cause problems for her, for Martin and for other residents; townspeople notice something unusual about Joe Penhale.

After successfully rekindling their relationship, Louisa and Martin are living together again, but Louisa finds herself juggling too many responsibilities at once. As Portwenn prepares for a wedding, Bert hopes to profit from the festivities.

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

Martin and Louisa begin couples therapy, but neither of them expects to receive homework. Louisa's former student Peter shadows Martin around the surgery for work experience. Mrs. Tishell's estranged husband returns and wants to give their relationship another go.