Ike is determined to save Judi Silver from Ben Diamond. Polaroids of Stevie and Lily surface. Vera tries something new to get pregnant, Danny and Mercedes' bond grows, and Klein's search ramps up.
Zuri enters the Little Miss Big Apple Competition against Lindsey, a kid who Agatha's watching. But when Jessie finds out that Zuri has no talent,she insists that Zuri lip sing. When Zuri plans to cheat on her schoolwork, Jessie apologizes for teaching her that cheating seems right. Zuri ends up doing an acting scene,but her and Lindsey don't win.
When Baljeet becomes concerned that he is losing his mental edge, the boys invent a cerebral stimulatory hat, or "Brain booster," to help him. But when the hat exceeds expectations and makes Baljeet exponentially smarter, he suddenly views everyone else as beneath him and becomes a threat to civilization by taking Earth's atmosphere and bringing it to the moon. Meanwhile, Dr. Doofenshmirtz plans to use his "Key-Find-Inator" to collect all the keys in Danville in hopes that it will lead to the Key to the City.
When the boys ask Candace to decide what they should do for the day, she slyly asks them to invent a device to attract their Mom so that she can finally bust her brothers. Meanwhile, Dr. Doofenshmirtz has invented a "Baby-Cry-Inator" designed to tarnish his goodie-two-shoes brother's image with the electorate.
Meg calls Dean and Sam and tells them Castiel is awake and talking. Meanwhile, a teenager named Kevin gets hit by a bolt of lightning and is turned into a reluctant prophet. Sam and Dean believe Kevin holds the key to defeating the Leviathans but must fight off two Archangels who want him for their own purposes.
When it looks like Percy’s nuclear weapons plan is getting out of control, Ryan suggests they go to the Director of the CIA, Morgan Kendrick, for help. Nikita is vehemently opposed to the plan and is surprised when Michael takes Ryan’s side. Tensions escalate when Nikita is proven right after they discover Kendrick has a link to Percy. Meanwhile, Sean is shot by Percy’s men, shaking Alex to the core.
Series Finale: Drastic changes take place at the Albuquerque WITSEC office. Mary finds herself caught between a witness and an unexpected family reunion.
Stephen Fry takes a lazy look at idleness with Ross Noble, Dara Ó Briain, Jeremy Clarkson and Alan Davies.
Danny and Jackie investigate the suspicious murder of a high rolling investor, who had injuries from a fight, but no marks on his hands. Meanwhile, Frank puts Jamie under house arrest, when the Sanfino family put out a hit on "Jimmy Reardon."
Four friends compete to embarrass each other in the ultimate hidden camera showdown. In the season finale, the guys toy with customers at a candy store using bizarre party props, they all try their hands at nosing, and they break the rules of appropriate elevator etiquette.
When Audrey and Jen makes plans to see a concert, Jeff makes solo plans and excludes Adam, whose feelings are hurt.
When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.
Klaus acts on his intentions to leave town with Elena, but finds resistance from a surprising new enemy. Bonnie calls on Abby to help her with a difficult spell. As events spiral out of control, Elena is determined to protect Caroline, Damon and Stefan enlist Tyler’s help, while Bonnie and Jeremy take a terrifying risk to make sure her spell is effective. Damon and Stefan have a surprisingly candid conversation about the future.
Finch gives Reese his birthday off so that his partner doesn't have to face a Number that is tied to Reese's past.
While investigating the murder of a surfer, Lisbon reconnects with her former fiancé, Kenny Johnson, who she hasn't seen in over a decade. Also, Cho questions his decision to be in a relationship with Summer.
The guys toy with customers at a candy store using bizarre party props, they all try their hands at nosing, and they break the rules of appropriate elevator etiquette.
Walter is forced to revisit his painful past when a fringe event causes people to spontaneously combust; the team faces off with David Robert Jones.
Detective Britten and Bird look into what appears to be a case of gang violence, but clues from his other reality force him to look a little closer. Meanwhile, Hannah uses her intuition to talk through a tough situation with Rex's girlfriend Emma. Later, Captain Harper finds herself having to take back a promise and Detective Vega is planning Britten's going away party.
The residents agonize over their oral boards, reliving every answer they gave during their exams; Arizona's close childhood friend comes to Seattle Grace for medical help; the doctors work on a patient who is missing one third of his skull; and Julia asks Mark to start a family with her. Meanwhile Catherine tells Richard that one of his residents has failed.