Jake is irritated by some of Annie's quirks, so he secretly enlists Kay in an attempt to modify her behaviour. In return, Jake helps Kay organise a Valentine's Day celebration for her new girlfriend.
Abby throws an "Adult Friendsgiving" dinner with new boyfriend. But as strange things begin to happen around the house, Abby and Jo question if a spirit has decided to join them. Phoebe invites Marco and Delia gets a surprise visit from her father.
A massive tsunami hundreds of feet high that never touches land; a secret underground base in China; an image from space may have revealed the location of the Garden of Eden.
After a chaotic first week in Los Angeles, things do not settle down when Abby and Holly have their biggest and most shocking fight ever, causing Holly to go behind Abby's back to work with a huge star despite the consequences. Maddie prepares for another big Hollywood job, and all the girls soon are on edge when Abby announces an open call audition in Los Angeles. Holly and Nia grow especially fearful of their futures with the ALDC.
A look at couples who have significant age differences with each other.
Anything goes as Alan Davies and guests Ross Noble, Janet Street-Porter, Angela Barnes and Michael Ball are given free reign to chinwag about Cher, crossbows and The Archers!
DiNozzo returns to the military academy he attended as a teen after a murdered Marine, who was an alumnus of the school, is found clutching the photo of a current student.
Leslie and Ben come under fire for participating in an old Pawnee tradition. April and Ron go on a scavenger hunt. Donna and Garry stroll down memory lane.
Moira is hired to be a local winery's spokesperson; David struggles with a health problem.
When the Machine arranges for Finch to sit on the jury of a murder trial, he begins to suspect that a fellow juror is set to rig the proceedings. Meanwhile, Reese begins to open up to the department’s therapist.
Peggy discovers the shocking truth about Leviathan but doesn't realize that her true enemies are even closer than she imagined. Meanwhile, Souza is close to confirming the truth about Peggy and may just put her in the crosshairs of the SSR.
In one of the toughest challenges of the season, the six remaining junior home cooks face the restaurant takeover challenge. The contestants split into two teams and take over a real Los Angeles restaurant. Find out which team is victorious and who advances to the Top 4.
While Barry, Harrison, and Caitlin hunt down Ronnie, who has attacked a man, Joe recruits Cisco to help him learn the truth about who murdered Nora Allen.
The artists have to design creatures based on unique sound effects created by sound designer Erik Aadahl.
While Leslie and April take a business trip to Washington, April wrestles with her future. Back in Pawnee, Andy tries to find April the perfect job.
An ice storm hits, forcing a citywide lockdown. Mills and Brett are left stranded in the elements while searching for a teen, and the firehouse members babysit a newborn. Elsewhere, Severide receives a job offer, and Chief Boden clashes with his father over his treatment.
A private matter goes public for Bay, leading to an investigation by the university.