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.

Cast:David Suchet, Philip Zimbardo,

Genre:Documentary,

country:United Kingdom,

Production:BBC,