A coproduction of WGBH and Harvard University, Justice: What's the Right Thing to Do? invites viewers to think critically about the fundamental questions of justice, equality, democracy, and citizenship. Each week, more than 1,000 students attend the lectures of Harvard professor and author Michael Sandel (shown), eager to expand their understanding of political and moral philosophy, as well as test long-held beliefs. Students learn about the great philosophers of the past — Aristotle, Kant, Mill, Locke — then apply the lessons to complex and sometimes volatile modern-day issues, including affirmative action, same-sex marriage, patriotism, loyalty, and human rights.

Sandel presents students with ethical dilemmas — some hypothetical, others actual cases — then asks them to decide "what’s the right thing to do?" He encourages students to stand up and defend their decisions, which leads to a lively and often humorous classroom debate. Sandel then twists the ethical question around, to further test the assumptions behind their different moral choices. The process reveals the often contradictory nature of moral reasoning.