Nine months into Lenny's papacy, he gives his first audience to the Italian prime minister. Dussolier carries out a controversial edict.
Elizabeth rejects protocol by appointing Philip to coordinate her coronation, but his ideas create conflict. The Duke of Windsor returns to London.
When Scott leaves the show for a new opportunity, Jason Mantzoukas takes over as special substitute host and his first guest ends up being Scott; legendary soul singer Donny Gary.
Margaret and Peter come to Elizabeth with a request. With a royal scandal about to break in the newspapers, the Queen Mother intervenes.
Sandi Toksvig hosts a nosey, noisy episode of QI with Aisling Bea, Corey Taylor, Ross Noble and Alan Davies.
As the Soviets test the H-bomb, both Churchill and Eden have major health crises. Angry about her inadequate education, Elizabeth hires a tutor.
Dan Jones explores the history of the Welsh capital's landmark, Cardiff Castle, and discovers more about the various incarnations over the centuries.
Margaret and Peter are reunited, but another obstacle stands in their way. Elizabeth is torn between her duty as Queen and her love for her sister.
The Rance family is engulfed in a firestorm of publicity; Father Tomas finds himself unexpectedly thrusted into the public spotlight, as his search leads him into a terrifying underbelly of the city.
Five-0 must free McGarrett's mother, Doris, when Catherine informs them that she was captured and is about to be executed after attempting to free Wo Fat's imprisoned father. Also, Chin loses his appeal to have Sara's adoption delayed, and she must move to Mexico.
A critical clue on Snake Island sends the team into the dangerous Paraguayan jungle, with more deadly predators than before. A historic artifact brings them closer to the treasure, but life-threatening encounters nearly end the expedition.
As tensions with Philip increase, Elizabeth spends time with her old friend Porchey. Churchill’s portrait is painted for his 80th birthday.
When dense smog cripples London for days and creates a serious health hazard, Churchill’s inaction leaves him vulnerable to his political enemies.
Riley skips out on helping Topanga at the bakery to stay home and binge-watch her favorite TV show.
Elizabeth and Philip go on an exhausting world journey. Margaret takes over some of her sister’s official duties and tries to liven things up.
Todd finally finds good gold at his new High Bar mine. Parker gives his foreman Rick his own operation and when Tony and Minnie decide to cut the dredge crew’s pay, a key crew member calls it quits.
Newlyweds are unnerved by a dangerous paranormal presence that they need to get rid of before their first child is born.
When a key witness in Danny's case is killed just before testifying, Erin angers Danny by enlisting Anthony to help him find the killer. Robert Lewis tries to force Frank to publicly support the Attorney General's investigation of the use of excessive force. Eddie and Jamie get the call for an attempted suicide.
Actress America Ferrera, whose parents and siblings are immigrants from Honduras, heads to Texas, the state with the longest border and home to 1.65 million undocumented immigrants. There she witnesses the difficulties facing Central American refugees living in the Rio Grande Valley where US Border Patrol checkpoints keep undocumented people hemmed-in and the American dream out of reach.