Boy, the seven trapped "guests" on 'Persons Unknown' (Mon., 10PM on NBC) cannot catch a break. They were randomly given three gas masks. What are the other four supposed to do? When is this gas attack supposed to happen? And the one lingering question: Who are their captors?

Well, the gas come, panic ensued, but it turned out it wasn't poisonous at all. But, the people who put on the gas masks were in for a huge surprise. Their masks filled with poisonous gas. Uh-oh.

Whoever is behind this crazy experiment is sure testing the boundaries of human nature.