On one of the hottest days of the year, the first responders feel the pressure as harrowing incidents keep happening around the city, including a road rage accident involving a van full of tourists, an emergency at an auto-repair shop and a veteran with a live grenade embedded in his leg. Meanwhile, Buck gets a surprise visit from his sister, Maddie (Jennifer Love Hewitt). Also, Athena questions her relationship with Bobby. Then, at the fire station, handsome new hire Eddie (Ryan Guzman) jeopardizes Buck's chances of being chosen for a fireman calendar.

When a massive earthquake rocks Los Angeles, the first responders rush to rescue victims from a crumbling high-rise hotel both under the rubble and high above the ground. Athena must deal with wreckage from a collapsed freeway overpass and Maddie is thrown into the fire as she faces her first crisis as a 911 dispatcher.

The plan involving Alexandrians, Kingdommers and Hilltoppers unfolds. As Rick continues to fight, he encounters a familiar face.

Conflict with the Saviors leads to unintended consequences for the Hilltop, the Kingdom, and Alexandria. Morality proves tricky in wartime.

A new weapon in the Savior arsenal proves to be a giant hurdle as fighting continues between Rick's forces and those of the Saviors.

A close look at Negan and the lives of the Saviors during the conflict through a familiar set of eyes.

With things looking up for Rick and the group, an argument breaks out at the Hilltop; the consequences of the decision are life versus death.

With things looking up for Rick and the group, an argument breaks out at the Hilltop; the consequences of the decision are life versus death.

Negan has to enlist the help of his lieutenants in solving a huge issue facing the Sanctuary; Rick and the group continue to enact the plan.

Every story and battle from the first half of the season comes crashing together in this action-packed, emotional mid-season finale.

Rick faces new difficulties after a battle. Meanwhile, the fight continues in other communities as core members face hard decisions.

Halloween finds the first responders racing to the rescue at a cemetery, a haunted hayride and a spooky Hollywood parade; Meanwhile Maddie thinks she has received a "ghost" call from a missing hiker; Hen finds herself facing with a life or death situation with the father who abandoned her; Eddie reconnects with his estranged wife.

Buck jumps back into the dating scene but fears he will return to his pre-Abby scoundrel-ous ways, while questioning if Maddie and Chimney are more than just friends. Emergencies involve a woman goes to great extremes on top of a freeway overpass to get the attention of her husband; A couple are involved in a car accident on their wedding day and a first date goes down the toilet.

The BAU implements an elaborate strategy to try and take down the "Dirty Dozen" hitmen ring, with Reid playing a central role.

When bodies are discovered in public places throughout Boston, the BAU investigates whether a taxi or ride-share service the victims used before their deaths could lead the team to the UnSub.

Government agents put the Jeffersonian on lockdown, and demand that Brennan and her team determine a cause of death for unidentified but highly classified remains; as the team begins to suspect they're investigating a famous presidential assassination, Booth's boss helps him break into the lab and find the truth; and a frustrated Cam worries that Michelle may be keeping a big secret from her.

When a man who collects artifacts attends his own funeral, the team must determine who was cremated and put in the urn. The answer creates a new investigation to track down a possible multiple murderer.

When human remains are discovered in the belly of a shark, Brennan and Booth are brought in to identify the missing person. Evidence suggesting the victim had been the prey of several fish directs the team's investigation to The Aquarium of the Atlantic, where a guest lecturer and notorious self-help guru preaching the healing power of the ocean has gone missing. Meanwhile, both Brennan and Booth navigate their own relationship when a marine biologist shows interest in Booth.

Special Agent Will Trent was abandoned at birth and endured a harsh coming-of-age in Atlanta's overwhelmed foster care system. Determined to make sure no one feels as he did, he now has the highest clearance rate.

Hen relives her evolution into the firefighter she is today as she recalls the first times she met Chimney and Athena.

The holidays are naughty and nice for the first responders, who must deal with a stampede at a toy store, a mistletoe stunt gone awry and neighbors competing in a Christmas-light showdown. Meanwhile, Bobby contemplates his future with Athena, Chimney and Buck attempt to lift Maddie's spirits and Eddie must decide if he wants to give his son what he really wants for Christmas - a visit with his mom.

When brides-to-be in Savannah are killed on the eve of their nuptials, the BAU suspects a jilted UnSub is at work.

When three restaurant workers are killed in a robbery/homicide in Las Vegas, N.M., the BAU looks at a cold case that happened in the town six years ago for leads.

When a human skeleton is discovered in the trenches of an old Civil War battleground, Brennan and Booth are called to the case. Despite the historical location, Brennan quickly identifies the bones as belonging to Dan Pinard, a present-day local dentist. While Booth investigates suspects, including the victim's former boyfriend, Hodgins and lab intern Vincent Nigel-Murray (guest star Cartwright) work doggedly to clean the bones of a stubborn clay residue which is preventing the team from determining a cause of death. Meanwhile, Booth's brother, Jared, (guest star Fehr) returns from his travels with some suprising news.

When the body of a rich adventure-seeker is found in a hotel laundry machine, Booth and Brennan's investigation leads to a Rock 'n Roll Fantasy Camp; at the lab, a fragment of prehistoric woolly-mammoth tusk (found with the remains) and Angela's knowledge of the music industry are used to connect the evidence to potential suspects; meanwhile, Cam looks for doctors for her daughter Michelle.

A cabin burns down in the woods revealing two bodies - one of a modern-day witch and one from the days of the Salem Witch Trials - leading Booth and Brennan into the world of Wicca to find a killer. Meanwhile, when Hodgins' reckless driving gets him and Angela arrested and thrown in jail, Sweets and intern Clark Edison (guest star Eugene Byrn) step into unfamiliar territory to help out the team.

A children's television star is murdered, and the team must look at backstage activities and the star's personal life to find the murderer. Meanwhile, Edison asks for opinions on his new novel, while Booth and Brennan plan Christine's first birthday party.

Remains found in a log in a forest belong to an art-school dropout who had lupus. The investigation reveals marijuana use to ease her pain, but her work at a dispensary may have had something to do with her death.

The team's latest case takes Brennan back to her alma mater, Burtonsville High School, where she and Booth investigate the discovery of an unidentified skull and upper torso. With Angela's help, they identify the victim as one of Brennan's classmates, and notice a possible connection to a second murder committed 15 years prior. Brennan and Booth go undercover as a married couple at her class reunion to interrogate a set of suspects, where even as an adult, Brennan is still predictably misunderstood and her only friend lies in a strangely dark and offbeat janitor. Meanwhile, Hodgins spills a lab secret.

Remains found in a log in a forest belong to an art-school dropout who had lupus. The investigation reveals marijuana use to ease her pain, but her work at a dispensary may have had something to do with her death.

When human remains are discovered in the belly of a shark, Brennan and Booth are brought in to identify the missing person. Evidence suggesting the victim had been the prey of several fish directs the team's investigation to The Aquarium of the Atlantic, where a guest lecturer and notorious self-help guru preaching the healing power of the ocean has gone missing. Meanwhile, both Brennan and Booth navigate their own relationship when a marine biologist shows interest in Booth.

When the body of a rich adventure-seeker is found in a hotel laundry machine, Booth and Brennan's investigation leads to a Rock 'n Roll Fantasy Camp; at the lab, a fragment of prehistoric woolly-mammoth tusk (found with the remains) and Angela's knowledge of the music industry are used to connect the evidence to potential suspects; meanwhile, Cam looks for doctors for her daughter Michelle.

A cabin burns down in the woods revealing two bodies - one of a modern-day witch and one from the days of the Salem Witch Trials - leading Booth and Brennan into the world of Wicca to find a killer. Meanwhile, when Hodgins' reckless driving gets him and Angela arrested and thrown in jail, Sweets and intern Clark Edison (guest star Eugene Byrn) step into unfamiliar territory to help out the team.

M.O.D.O.K. suddenly returns to AIM as a model employee, throwing off everyone at the organization. Austin attempts to reveal to M.O.D.O.K. the terrifying truth about GRUMBL, while Gary and Monica conspire to find out what M.O.D.O.K. is planning.

Lou's bar mitzvah doesn't attract many guests, so M.O.D.O.K. is forced to invite the villains and creatures he's met along the season. Young M.O.D.O.K. attacks and puts the family in a precarious situation before taking M.O.D.O.K. into the time stream. Young M.O.D.O.K. reveals that if M.O.D.O.K. truly wants to take over the world, his family has to die. M.O.D.O.K. is forced to make the toughest decision of his life.

The first responders continue to deal with the fallout of a massive earthquake and its deadly aftershocks; Bobby and the team continue to rescue victims from a collapsing high-rise hotel.