Mike Curd

The premiere of The Dark Knight Rises was the big event in Aurora, Colorado. So popular with young cinema-goers, the city's theatre complex put on an extra showing. But minutes into the film, lone gunman James Holmes, dressed as the Joker, entered the room and started firing indiscriminately. Twelve people died, many more were injured. This documentary tells the life story of Holmes, of his victims and speaks to survivors.

Historian Dr Janina Ramirez unlocks the secrets of a centuries-old masterpiece in glass. At 78 feet in height, the famous East Window at York Minster is the largest medieval stained-glass window in the country and it was the creative vision of a single artist - a mysterious master craftsman called John Thornton, one of the earliest named English artists. The East Window of York Minster is far more than a work of artistic genius, it is a window onto the medieval world and the medieval mind - telling us who were once were and who we still are, all preserved in the most fragile medium of all.

This may be the one of the most important Horizon films of recent years. Climate scientists have just discovered a phenomenon that threatens to disrupt our world. It may already have contributed to the deaths of hundreds of thousands through drought and famine. Unchecked, it will strike again. The good news is that there is a cure. The bad news is that the cure may be worse than the disease. If they are right, then in tackling the one problem, we may unleash a climate catastrophe on our planet. This is a film about stark choices and about the dawning realisation that all our predictions about the world's climate may be completely wrong. At its heart is something that scientists are calling "global dimming".

An intensive psychological test by Professor Philip Zimbardo in 1971 saw US students volunteer to play prisoners and guards in an bid to examine the nature of good and evil. Within five days, four prisoners had broken down and another was on hunger strike. This film, containing strong language, reveals why the test was abandoned after less than a week.