Homer's enthusiasm skills land him a job at a secretive company with a mind-altering agenda.

Brilliant and brusque renowned surgeon Martin Best leaves his lucrative career in Boston to become the general practitioner in the small seaside village of Port Wenn, Maine. One local teacher, Louisa Gavin questions his harsh demeanor, while Martin quickly gets annoyed by the antics of its town locals, all while hiding his debilitating aversion to blood.

Krapopolis is invaded; the gods call Deliria's bluff.

Hope Valley prepares for the opening of Goldie National Park; Elizabeth, Nathan, Allie and Little Jack return home, but is it for just the weekend.

Tommy hires help for his father as Cami makes a risky move.

Malik bends the rules to help a heartbroken colleague deal with a painful prospect. Elis confronts a menacing figure from his past.

While Graciela and Mateo dress up to confront a rival over stolen designs, Bobby's plan to find a traitor at Sofintim reveals unexpected truths.

Simon learns about his daughter's life at university - and his wife's secret. Dee Dee and Ash put a violent end to a chapter of their traumatic past.

Mary finally admits her PTSD to Hamish. Andrew feels lost after his campaign. Lillian meets Ash's lung recipient, but the visit turns hostile.

Victoria Coren Mitchell hosts the quiz where knowledge only gets you so far. It's the first of the semi-finals - the questions are tough, but so are the teams.

Hana finds a clue which changes everything, Delaney and Peterson try to defuse the bomb onboard the jet, and Banks and Jess uncover vital evidence.