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Millions will miss Lady Violet's withering one-liners now that Downton Abbey is over. Chris Bowlby profiles one of Britain's most successful actors: Maggie Smith. Her extraordinary career has spanned Shakespeare on stage, Hollywood films and, of course, popular televison drama.Producer: Smita PatelPhoto credit: "Downton Abbey" / Carnival Films.

Elon Musk, the billionaire owner of SpaceX and Tesla Motors, has a plan to stop computers from taking over the world. The co-founder of Paypal - who made his first fortune in his twenties - has joined other tech giants to fund a not-for-profit company called OpenAI. Its aim is to develop the most advanced forms of artificial intelligence and then to share the results. Musk is among a group of thinkers - including Stephen Hawking - who have warned that AI could eventually lead to the end of the human race. His idea is that by making AI 'open source', powerful corporate interests will be kept in check. Mark Coles explores the life of a man with a passion for rockets, cars and a plan to retire to Mars.Producers: Smita Patel and Sally Abrahams.

Mark Clarke was once a rising star in the Conservative Party. He was a prominent figure who started and led 'RoadTrip2015', a project to bus young Conservatives into marginal seats to campaign door-to-door. Clarke was dubbed the 'Tatler Tory' after the magazine tipped him as a future minister. But he was recently expelled from the party following lurid allegations of blackmail and bullying, and the tragic suicide of one fellow activist.Presenter: Mark Coles Producer: Sonia Rothwell.

Online hacking collective Anonymous declared "total war" on IS after the attacks in Paris. Their tactics have often been controversial, sometimes illegal, and don't always win them support. As so-called Islamic State vows to fight back, what is Anonymous likely to achieve and will its strategy help or hinder the fight against extremism?Presenter: Becky Milligan Producer: Ben Crighton.

Known by many in her country as 'The Lady', Aung San Suu Kyi has become one of the world's most famous female politicians. And yet she has never exercised any power in Myanmar, formerly known as Burma. Under the country's current constitution, she is forbidden from becoming president. Will she find a way of ruling the country if, as is expected, her party The National League for Democracy wins this weekend's elections?Aung San Suu Kyi's political career, which began dramatically with the failed uprising of 1988, has been shaped by the memory of her father, General Aung San, who is regarded as the founder of modern Burma. Her life has been marked by loss: her father was assassinated when she was two, her older brother died six years later and her British husband, Michael Aris, died when she was under house arrest. How has Aung San Suu Kyi remained committed to her struggle to bring democracy to the country?Presenter: Mark Coles Producers: Katie Inman and Peter Snowdon.

She's the self-proclaimed Beyoncé of the House of Lords, calling herself a 'single lady' and an 'independent woman'. Baroness Tina Stowell is the Leader of the Upper House. She was in the spotlight this week after the Lords defeated the government over tax credits. After leaving school at 16, Baroness Stowell's journey to this position has been a discreet one. How will she negotiate the potentially testing times ahead as the government contemplates reform of the House of Lords? Presenter: Edward Stourton. Producers: Charlotte Pritchard and Peter Snowdon.

He's been a boxer, a bouncer and a bungee jumping coach. Now he's the Prime Minister of Canada. Justin Trudeau is going back to his childhood home, 24 Sussex Drive, the PM's residence in Ottawa. His father, Pierre Trudeau, was a previous resident. Justin Trudeau is young and charismatic. He might even be the world's first tattooed national leader. But who is he? What does he stand for? And can he live up to his famous name?Presenter: Mark Coles Producers: Charlotte Pritchard and David Rhodes.

Saudi Arabia's human rights record is firmly back in the spotlight. A teenage boy on death row for protesting. A British pensioner expecting to be lashed. Britain no longer willing to help train those running the Kingdom's jails. Our subject this week - Saudi interior minister Prince Mohammad Bin Nayef - is right in the thick of it. Mark Coles profiles the man who is a crucial counter-terrorism partner for Britain and United States, and a hardliner who is next in line to the Saudi throne.Producers: Chloe Hadjimatheou and Katie Inman.

Bernie Sanders is a socialist and a grump. But is he also a future US president? Some 20,000 people recently turned out to hear Sanders speak - the sort of crowd Barack Obama would have been proud of in 2008. He is, it seems, an increasingly viable contender for the Democratic presidential nomination.Sanders has spent the last forty years attacking inequality and he is known for giving loud and impassioned speeches. But he can also be prickly with the media and he doesn't do small talk. So could Bernie Sanders, the self-styled socialist and "grumpy old guy", beat Hillary Clinton - and the Republicans - to become the next President of the United States? Chris Bowlby reports.Producers: Keith Moore and Ben CrightonThe song "Feel the Bern", used in this programme, was performed by Tony Tig and produced Corbett.

Gina Rinehart - one the world's richest women - is about to realise a lifelong dream: to own and operate her very own iron-ore mine. Rinehart's life has been defined by huge success and the staggering speed at which she has accumulated her enormous wealth - but also by family feuds which have pitted generations of her family against each other. Mark Coles profiles the controversial Australian billionaire.Producers: Ben Crighton and Chloe Hadjimatheou.