Hamilton investigates the pharmacology and traditional uses of Kratom, a Thai tree with opioid-containing leaves.
An abandoned megacity in a remote jungle might be the home of an ancient treasure and a dark secret; when a mysterious circular stone structure is discovered in Scotland, experts investigate whether it's the fabled Round Table of King Arthur.
Frankie and Sue are devastated when Axl informs them that he's not going to church; Mike goes to war with the Glossner kids after they keep defacing his giant inflatable snowman; Brick attempts to wrap his first present.
After visiting a homeless shelter on Christmas Eve, Courtney realizes things for the needy could be improved and pledges to make it a joyous Christmas that every family deserves. But when he learns he doesn’t have the budget to deliver on his promise, Courtney loses hope and his holiday spirit.
As the squad investigates the mysterious death of a second woman related to the Tackles case, and a new theory materializes, Sharon faces a health setback. Meanwhile, Gus reacts unexpectedly to Rusty's partial solution to their ongoing relationship problems.
As head of the HOA Christmas committee, Jessica threatens to cut the neighborhood caroling this year due to last year's rocky performance. However, Deirdre says that her friend Holly, who teaches "Performance and Movement," will help get everyone into tip-top, melodic shape. Meanwhile, Marvin becomes suspicious of Honey when she goes to see "Titanic" at the movies without him; Nicole develops her first girl crush and struggles with how to get her attention.
As Christmas approaches, Bull is amused when he meets a 9-year-old girl who wants to hire him to help her divorce her parents, but he's shocked when a judge appoints him her temporary guardian. Also, Marissa discovers disturbing information about her boyfriend, Kyle.
Chip and Joanna take on a historical project for Courtney and Joey Scrivano, who are ready to upgrade from their modest loft to a house where they can raise their new baby; the 1927 Tudor home is outdated and lacks a true master suite.
Convinced that the universe is leading the way, a very confident Kevin heads to Laos with Tyler in search of the first righteous soul. Meanwhile, Yvette has her doubts about their mission and has a chance encounter with Tyler that changes both of their outlooks. Back in Texas, Amy goes all out decorating for Christmas and decides whether or not she’s truly ready to date again.
Appa inherits Janet's old smartphone. Umma finds a pest in the store. Kimchee tries to help Janet cure her case of the FOMOs while Jung tries to reconnect with a girl he met at a bar.
Intensely private Rosa shares personal news with the team but wants Jake's help to tell her parents. Cyber Crimes steals the Nine-Nine's bandwidth.
After years of searching and speculation, the Lagina’s and their team unearth evidence of what Marty believes proves the exact location of the ultimate target — The Money Pit.
A husband has gone missing from a happy marriage, but a trail of e-mails detectives followed toward the killer has suddenly gone cold. Does the widow know more than she's telling?
While searching for the answers behind the mysterious return of the Titans, Megatron is confronted by the Combiners who are determined to kill him.
The world is obsessed with pizza, and we're getting to the bottom of it. From a resin encased slice to a 24K gold pizza, we're exploring why pizza culture has peaked.
Sam tells the story of the Barbary Corsaire pirates, and the tale of King Louis the Lion.
Julia's childcare woes are over when she finds the perfect nanny, but her friendship with Liz becomes strained. Amanda keeps a low profile after Kevin blurts out her secret.
Casey travels to Louisville, KY, for some epic eats, including a booze-infused Southern staple and a one-of-a-kind spicy popcorn and frozen hot chocolate challenge in nearby Santa Claus, IN.