This episode demonstrates the production processes for hot rods, decorative eggs, fire hose nozzles, baseballs.
The wife of a murdered chef, Bao Di, hires Emerson to investigate the death of her husband. They soon discover that Bao was heavily in debt, and wagered his daughter Mei's hand in marriage to cover his markers.
LaVonda and Noleta arrive in Los Angeles for the opening of Ty's play, but Ty has other problems; G.W. proposes to Peggy; Bitsy Mae shares her feelings with Glyndora; Latrelle kicks her pill addiction; Sissy confesses to killing the goat and is arrested along with Noleta; Brother Boy blackmails Bumper and he and Jackie make their escape.
Sam and Naomi are against each other to lead the practice with unexpected results. Addison treats a girl trying to hide her past while Cooper has a dilemma of his own affecting his professional career.
The BAU investigates a series of murders that appear to be connected to a killer who jumps trains and chooses his victims based on their proximity to the railway.
Giant guinea pigs are attacking cities all over the world. The boys have the key that will save everyone from the onslaught but they're stranded in the Andes Mountains.
Discontent with being raised by his octogenarian Father and depressed, middle-aged half sister, Joe searches for a more vibrant guardian.
As Election Day nears, Patrick insists on taking his relationship with Carmelita public; Ellen's brother, Chase, demands to know the truth about his sister's death; Nick and Lisa go to couples therapy; Brian Jr. goes missing.
Christine and Barb prepare for a casual, non-relationship-seeking double date with two guys they meet at a video store, but jealousy arises when only one of them gets asked out for a second date.
The CSI team investigates the shooting death of an archaeologist whose secret life may have caught up to him.
Matt grapples with his mother, his emotions and Coach Taylor as McCoy garners more attention. Tami tangles with Tyra about Julie and Tyra's interest in Cash. Tyra experiences Cash's darker side. Erin disappoints Jason.
A baby with AIDS has Benson and Stabler asking for assistance from Warner as they investigate the case. They are pointed in the direction of a homeopathic doctor who has an questionable ethical past and who had prescribed the baby ineffective vitamins.
With Lucas back within MI5 he reveals that the Russians interrogated him about Operation Sugar Horse, the most secret ongoing spy operation MI5 ever had. If the Russians know about it, then MI5 has a very high level mole. Harry seeks out his mentor, The Spycatcher, to help him find the mole. Ben is undercover with an Al-Qaeda cell; they are planning to bomb London and what looks like a dry run unexpectedly turns live.
The Suttons say goodbye to Johnny, and Charles pops the question.
Mike teams up with the boys from Bartos Bait & Fish to catch leeches that will later be sold for fish bait. Then it's off to the Green Tripe factory in Hollister, CA where Mike helps make BARF (Biologically Appropriate Raw Food) for dogs.
Gibbs and his team are searching for a cyber serial killer who takes videos of his victims. The team quickly finds out that the video's of the dead victims are false.
Alien pods are discovered in an abandoned garage; a retirement-home resident has a deadly gift; a patient wishes to be reattached to his formerly conjoined twin; a power-company employee confronts a scientist who is stealing power to create the ultimate weapon.
Casey is in panic mode after the diary that details her unsettling romantic dreams about Truman goes missing. Believing that Derek and Edwin took it, Lizzie and Marti attempt to get the diary back by making their stepbrothers' lives miserable.
After recuperating from her health scare, Adrianna returns and tries to make amends with Naomi, but her ex-BFF refuses to forgive her for the betrayal. Adrianna makes a surprising connection with Navid, who helps her through her situation. Meanwhile, Annie and Ethan finally take their rapidly growing romance to a new level during the school's homecoming dance, causing Naomi to feel jealous.
Vic closes in on Shane, Mara and their sick young son; Claudette dismantles the Strike Team; Pezuela offers Acevada "assistance" for his mayoral campaign; Rita Denton (Frances Fisher) comes on to Dutch; and Billings' ex-wife and daughter are fearful when a registered sex offender moves into their neighborhood.