Actress Julianna Margulies; grocery bagging champion Kyle Perry; Broken Bells perform.

Gibbs and the team investigate the shooting of a Marine and uncovers more to his life than anyone would have ever imagined.

After a sailor is killed during an underground street race, the NCIS team determines that his car had been sabotaged and contained confidential Navy equipment. Meanwhile, Callen is forced to take traffic school.

Adam and Kristina try to cope with their son's Asperger's Syndrome. Sarah is job hunting with the help of Zeek that pushes her to dream big. Meanwhile, Crosby bonds with his son and Julia deals with a difficult mom from Sydney's school.

Wedding bells are in the air on the estate, a little too frequently for the police, as the Maguire's exploit a new money-making scheme. Business turns to pleasure when Shane asks Kelly to marry him, but his dream soon becomes a nightmare when she turns him down. As his life unravels Shane uncovers a terrible betrayal by those closest to him and must suffer for the sins of his father. Hitting rock bottom he finds the strength to make an important decision. Now Libby and her mother are firmly nestled in the Gallagher house, Frank 'volunteers' to paint Patty's converted bedroom. But in the pursuit of a bargain, Frank falls and feigns injury leading to a potentially disastrous face-off with Patty. Elsewhere, Chesney holds a house party to get close to Sammy, but a promise turns to a threat when blood is spilt, leaving awful consequences.

The teams pull trucks and load crates onto the vehicles for a challenge that ends with a puzzle. Later, the contestants work eight-hour shifts at the food bank and must learn to fit workout sessions into their schedules.

Pringles recalls its two best flavors, and Annie Leonard says Americans have too much stuff.

Peter strategizes on how to handle his retrial and the next steps in his public rehabilitation. Alicia and Will defend an attorney charged with murder.

Tonight's guests are actress Lisa Kudrow and actor Adhir Kalyan.

After months of searching, Neal has finally found the object of everyone's desire - the music box. But in order to get it, Neal is going to have to first get his tracking anklet turned off. Meanwhile, Peter and Diana try to take down Fowler.