Steve Backshall explores the world of parasites, including tapeworms, mosquitoes and cuckoos, investigating the skills they use to exploit their hosts

Steve Backshall explores dangerous wildlife in Venezuela, including green anacondas, vampire bats and scolopendras - giant venomous centipedes

Jeremy Clarkson, Richard Hammond and James May try to impress Oxford residents by building an electric car, and refuse to let an unenthusiastic response deter them from sitting in on the machine's crash-test before handing it over to the Stig's environmentally friendly cousin. Actor Michael Sheen is the Star in a Reasonably Priced Car, and Jeremy pits the Corvette ZR1 against the Audi R8 V10

The intrepid reporter explores different aspects of Los Angeles, beginning by meeting the characters whose lives revolve around the city's neglected and feral dogs. He goes on patrol with a man on a mission to rescue some of the thousands of stray and ferocious pit bulls roaming the streets and meets hard-pressed staff at LA's largest animal shelter. Louis also encounters training gurus who claim to be able to take the ghetto out of the dog once it has been removed from that environment

Louis explores the American attitude to death as he visits Cedars-Sinai Medical Centre in West Hollywood, where he meets people battling against serious illnesses. He talks to patients and their families as they face whether to accept death and die in relative comfort, or to gamble on further, possibly painful treatments to prolong their lives, and meets the doctors whose job it is to guide people through the traumatic process

California has some of the toughest regulations controlling sex offenders anywhere in America - after leaving prison they can spend years on parole being tagged and tracked and a lifetime on an online register. In his final film exploring different aspects of life in Los Angeles, Louis Theroux visits hostels to talk to parolees as well as the people charged with monitoring them, and asks whether the restrictions keep society safer and when, if ever, it is right to give sex offenders a second chance