Star Trek the Next Generation: Masks

The U.S.S. Enterprise is on a mission to Lorca-a world where all beings wear masks to show who and what they are. On Lorca, captain Picard, Commander Riker, and an away team put on masks of their own and try to make friendly contact with the people. But they don't know that a madman is part of the away team-someone who would do anything to become king of Lorca. Will Picard and Riker be able to stop this madman before he puts his plan into action?