The Top 20 dancers hit the stage for their first chance to compete.

The Time Warp team's slow-motion cameras capture amazing footage of automatic weapons, throwing knives and tricks with fire.

Adam and Jamie get the Blue Angels to find out if a sonic shock wave can shatter glass. Tory, Grant and Kari take on this season's most requested myth: Can you really bend bullets around obstacles with a side arm flick, as it was done in the movie 'Wanted?'

One Team UK member is exposed for his embarrassing habit, while another suffers an injury in training. And in two action-packed semifinal match-ups, four lightweight fighters slug it out to earn their spot in the live finale.

When a drug store owner is shot while running down the street naked, Walsh and Shraeger investigate. Information from the boyfriend of the victim's daughter leads the detectives to a loan shark that the victim had an argument with a few nights earlier. After a series of tapes from an apology line service turn up missing Beaumont and Cole look into the theft. Meanwhile Delahoy convinces the medical examiner to give him an MRI, and he receives some unexpected news.

Wanting to boost their recruitment numbers, the Reno sheriffs department has a well-known Reno movie director film a commercial.

- The feud over coffee sponsorships boils over as Joe Scarborough calls Jon an angry man with a Napoleonic complex
- Jason Jones visits the offices of the New York Times
- A Guantanamo detainee arrives in New York

Stephen broadcasts from Iraq

The blue team say goodbye to another contestant.