The attempt to send and land astronauts on Mars risks billions of dollars and the lives of those brave enough to attempt it. Is the possible benefit really worth the risk? And is it really achievable? Guiding us through this ethical and scientific minefield is Dr Kevin Fong. Kevin's diverse background in astrophysics, aeronautics and medicine makes him uniquely placed to understand the technical and human challenges of this perilous journey. He leads us through the journey to Mars stage by stage. For Kevin, not only is this the toughest journey we will ever attempt, it is one that he feels we ultimately must make if we are to survive as a species.

This series, acclaimed by the public and praised by critics, explores the story of Steven Avery, a man from Manitowoc County, Wisconsin, who served 18 years in prison for the wrongful conviction of sexual assault and attempted murder of Penny Beerntsen, before being fully exonerated in 2003 by DNA evidence. "Eighteen Years Lost" When Steven Avery is freed from a wrongful conviction, his search for justice raises questions about the authorities who put him behind bars.

Laurie Anderson embarks on a cinematic journey through love, death and language. Cantering on Anderson's beloved rat terrier Lolabelle, who died in 2011, the film is a personal essay that weaves together childhood memories, video diaries, philosophical musings on data collection, surveillance culture and the Buddhist conception of the afterlife, and heartfelt tributes to the artists, writers, musicians and thinkers who inspire her. Fusing her own witty, inquisitive narration with original violin compositions, hand-drawn animation, 8mm home movies and artwork culled from exhibitions past and present, Anderson creates a hypnotic, collage-like visual language out of the raw materials of her life and art, examining how stories are constructed and told - and how we use them to make sense of our lives.

Lurking in the shadows of the Internet, a faceless modern-day bogeyman has attracted the attention and fear of a young generation who whisper his name online. Slenderman lives on the dark pages of the web, where impressionable youth create and cultivate his mythos in message boards, YouTube clips and various other digital incantations. But the online fairy tale becomes a shocking real-life horror as two 12-year-old girls, guided by their devotion to Slenderman, lure their friend into the woods to attempt a seemingly inexplicable, brutal murder. From the depths of one the Internet's most unsettling creations to the court case that must consider the consequences, Beware the Slenderman brings to light questions of accountability in an age where young, growing minds are only a few clicks away from creating and consuming something that may influence them to commit unspeakable crimes.

Director Chris Bell turns his camera on the abuse of prescription drugs and, ultimately, himself. After witnessing friends and relatives face tragedy as they become addicted to prescription drugs, Bell sets out to explore the goals of pharmaceutical companies and doctors in this ever-growing market, and asks how they are any different from back-alley drug-pushers. His journey leads to experts on the nature of addiction in our culture, as well as to pharmaceutical whistleblowers that testify to the solely dollar-driven aims of pharmaceutical companies.

Werner Boote presents an up-close and personal view of the controversial and fascinating material that has found its way into every facet of our daily lives: plastic. He takes us on a journey around the globe, showing that plastics have become a threat for both environment and human health.