If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as a refuge from an alien attack? Rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico continue to swirl, Native American legends mention strange inner-Earth beings, and recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind.
The sky is falling or at least people are. The CSI's try to figure out if it was murder or sucide after a man is dead after falling from a hotel. Across town, a elderly woman falls through her table and her husband dead in the shower. The only two witnesses to the crime are an incooperative cat and a parrot who pleads the fifth.
The residents are on their own with the dreaded night shifts while the attendings go out to play to celebrate Derek's grant for his clinical trial.
Keeping the basement rodent-free drives Charlie to the brink. The gang throws Charlie a surprise party.
A monsoon threatens to spoil Todd's plans to get the office so that he can reach a sales quota on Black Friday in order to win a trip to Hawaii for his parents.
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
An event for a candymaker (Wayne Knight) turns bitter when human remains are discovered in the world's largest chocolate bar; Cam struggles with her daughter's decision to attend a college that fails to meet her high standards.
When a serial kidnapper “over there” strikes again, the emotional and familiar case hits home for Colonel Broyles, sending a determined Olivia to uncover additional details about the abductions. In the meantime, Olivia fights on and reunites with Henry to enlist his services on an intense and covert mission to return home.
Michael must work with an enemy to keep chemical weapons out of the wrong hands.
When Jeff tries to obtain credit for a fictitious class, the unintended consequences rock Greendale. Abed and Troy build an elaborate blanket fort.
Michael tries to save Ryan's company by encouraging co-workers to invest. Meanwhile, Dwight has big plans for the office at Thanksgiving.
Patrick Jane accepts the help of a local astrologer, Ellis Mars, to solve the puzzling case of a triple homicide that involves two policemen and the fiancé of an EMT worker.
Jamie and Adam test whether a '70s sport car is as aerodynamic backward as forward, while Grant, Tory and Kari take a surfboard scene from Lethal Weapon 2 to task.
Chance and Guererro stage a daring rescue of Winston from the hands of his torturous kidnappers. Two beautiful women join the team: billionaire philanthropist Ilsa Pucci, who fears for her life after the mysterious death of her husband; and Ames, a chameleon-like master thief who inadvertently becomes involved with the plot to murder her new associate.
Brick pleads with Frankie to leave him home alone when she runs errands.
The campus nerds revolt, leaving the jocks unable to function academically and causing an identity crisis in Sammy.
When an 8-year-old is found murdered on the Appalachian Trail, the BAU team goes deep into its forests in search of a man lurking in the wilderness who is targeting children.
It's Manny's birthday and the family is gathering at a restaurant to celebrate, though Manny himself is depressed about getting older. Phil and Claire decide to engage in a not-so-friendly car race on the way to the restaurant, and Mitch and Cam get sidetracked when they stop at the mall to pick up a gift.
The duo examine the world of domestic novelties, including a makeshift mill constructed by a young inventor from Malawi. There is a visit to inventor Trevor Baylis, a look at a collection of vintage tea-makers, former engineer and code breaker Tony Sale revives George the Robot, and science reporter Jem Stansfield meets an A-level student with a home-made fridge built out of scrap metal originally designed by Einstein.