As fog begins to cover Seattle, the doctors of Grey Sloan navigate through personal complications. Meredith and Alex attempt to save Gus, while Levi talks some sense into a struggling Nico.
To right a wrong, the Nine-Nine teams up with the worst of the worst of the NYPD. Terry sinks into deep denial about his future.
In this special episode, gator season may be over but Troy Landry is still battling monsters in the swamp. A snake invasion is threatening the community and Troy calls in some friends to help him track down the sinister Voodoo Python.
Tandy and Evita must go to great lengths when Tyrone is put in a dangerous situation. Meanwhile, Adina looks to someone surprising for help.
Jake and Boyle hunt for a serial killer under the watchful eye of Commissioner Kelly. Terry learns that more money does indeed bring more problems.
The members of Station 19 pack their gear and head to Los Angeles, California, to help battle a deadly wildfire raging out of control. While the team works to evacuate residents, they meet Terry, and Ben makes a split-second decision that changes both of their lives.
Amy and Jonah find themselves on opposing sides as corporate tries to win over employees by showering them with treats. But when the company's tactics grow more extreme, everyone must band together to save one of their own.
Sheldon and Amy await big news. Meanwhile, Penny and Leonard have some big news of their own. Also, Howard and Bernadette face the stressful challenge of leaving their kids for the first time and Raj makes a new friend, as the gang travels together into an uncharted future.
Sheldon invites the entire school to a party for the Nobel Prize announcements. Also, Connie learns more about Dr. Sturgis' past, and Georgie's desire for cable TV leads to a standoff between him and George Sr.
With Huey’s and Webby’s help, Fenton woos a punk-rock scientist, Gandra Dee, only to uncover her dangerous plans for Gizmoduck.
While investigating the deaths of Gulliver and Nancy, the dynamic duo of Seattle's winning dance team, Liv and Ravi go undercover as dance partners to size up the other contestants aka the prime suspects. Meanwhile, Peyton confronts Major after she's told that one of his soldiers was out of line during a routine lice check at the school. Lastly, Clive and Bozzio receive a shocking surprise during Lamaze class.
Jane is having a hard time dealing with Rafael avoiding her, so when an issue with Mateo comes up she uses it to get some face time. Rogelio turns to Jane for help when he learns his pilot is in trouble. Alba and Jorge enlist Xo’s help to study for their upcoming immigration test. Meanwhile, Petra finally gets to the bottom of who has been terrorizing her.
Nigella and contestants are given historical recipes at the State Library of Victoria to inspire a three-course meal. The team who create the least impressive menu will head into the next elimination.
A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party.
Brockmire deals with sobriety-induced impotence and Matt's declining health. Brockmire's sponsor reminds him that he needs to find a higher power if he wants the AA program to rid him of his anxiety.
Stuck as a shadow, Lena tries to protect Webby from her suspicious new friend Violet during a supernatural Sleepover.
Smoothie + Hailey take a trip into the past. Sax hits rock bottom. Good thing Happy brought a cake.