The BAU travels to Houston to investigate a series of murders that have occurred near construction sites and abandoned buildings. Because the murders appear to be random, the team believes the killer could be a homeless person. Meanwhile, everyone is noticing an apparent change in Reid's behavior.
When Veronica is released from jail, she is contacted by Josh Barry who is desperate to prove his innocence in his father's murder. Meanwhile, Keith gets bittersweet news from the county commissioner, and Logan helps Mac and Parker on a scavenger hunt.
This episode demonstrates the production processes for CO2 cartridges, pretzels, scissor lifts and skating rinks, and shows how each is made.
The team participates in a unique competition known as the CT Games that puts them up against other Special Forces units from around the world. Things take a bad turn when one of the teams appears to be taking things too far to win. Kim must travel to Utah to save her job and finds herself meeting an ex-lover. She spends some time getting reacquainted with him.
Mike helps dig tunnels that are used as underground wine caverns. Later he works behind the scenes with Southwest Airlines as a baggage handler. He also gets to work with the airport incinerator.
Lorelai helps Emily organize domestic affairs but has trouble revealing the current state of her love life. Rory attends a birthday dinner for Logan.
When a Navy Lieutenant becomes the victim of radiation poisoning, the NCIS team must find the person who's behind the crime. The Lieutenant, who is working for the IAEA (International Atomic Energy Agency), claims that only his two colleagues knew about his assignment, and whoever it was, the person tried to stop the Lieutenant's next investigation.
The Man with the Yellow Hat has a hobby playing the tuba in Rescue Squad 86's firehouse band. George becomes excited at the thought of a band, but the Man will not let George play his tuba. George then decides to make his own instruments and that his animal friends will be the ones playing them. The only problem is that his animal friends seem to get distracted too easily and, after causing a loud racket on the roof of the apartment building where they are practicing, someone calls the fire department.
Explosions across the estate spark fears that Chatsworth is a terrorist target. But it has the Maguire's worried that they're under threat from folk a little closer to home when Patrick finds the family semtex missing. Meanwhile when Frank reveals to Monica she was never his first choice over Sheila, Monica vents her anger by turning to Norma for gifts and goodies.
Lucy has trouble sleeping. Willa teams up with Don to uncover a secret celebrity wedding. Julia deals with rehab while Holt deals with his career.
To catch a predator shows us the investigations carried out using the hidden camera from Dateline NBC.
On an assignment to return a career safe breaker from prison for further questioning, Tyler, Ray and Chris are attacked by robbers and the man who they were taken in for questioning is broken out. Is a local gangster to blame, or is there more going on than meets the eye... specifically, was the crime actually arranged by Gene's old mentor? Meanwhile, Sam tries to break in the first black detective in the department, a man who will later become Sam's mentor when he first joins the police force.
Alan tries two different cases, including the defense of a therapist who was fired for his belief in UFOs. Meanwhile, Clarence is confused by Claire's dinner invitation; and Bethany tries to bring out Denny's spiritual side.
Stabler finds himself drawn into a case where a young mother has committed suicide after her baby goes missing. The case leads to questions for Benson about her own family history.
To raise money for new toys, Henry decides to sell his parents' belongings to his friends, and sells Peter to Margaret as a 'slave'.
An investigation into the murder of the wife of a televangelist leads to the discovery of a seedy relationship he had with a hustler that may have contributed to the crime. Meanwhile, Goren runs into his brother while visiting his ailing mother.
The CSIs investigate when the parents of a baby sitter in an upscale neighborhood are murdered. As the team sorts through the neighbors' secrets and lies, they find an unexpected love triangle as a motive for murder. Meanwhile, a key piece of evidence found at the crime scene leads Horatio to expose a doctor with some dirty secrets of his own.
William and Monica's wedding bliss comes to a screeching halt when, while drunk, he expresses doubts about marrying her.