Michael and Mahone try to lure Whistler out of his hiding place. T-Bag gains some upward momentum in the prison hierarchy as the water supply is running low.
Lincoln meets familiar and not so familiar faces on his quest to free Michael.
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
Tonight Stephen welcomes New York Times columnist and author of The World is Flat [Updated and Expanded]: A Brief History of the Twenty-First Century, Thomas Firedman