Olivia begins to regain her memories of her encounter with William Bell. Meanwhile, the "First Wave" tries to collect the head of their leader, and the traitor makes his move.
A Nazi claims to have knowledge about the blackouts. Meanwhile, Demetri receives an anonymous tip about the future, and Aaron tries to get approval to have his daughter's body exhumed.
The Dunder Mifflin staff head to Niagara Falls for Jim and Pam's wedding, with the understanding that her pregnancy is a forbidden discussion topic, but Jim's slip of the tongue prods Michael to attempt damage control.
Frank's behavior is more bizarre than usual---so bizarre that even the gang notice---so they decide to stage an intervention.
K'nuckles tries to prove he's a captain by visiting a sunken ship to collect his captain's papers.
Jules family and friends crash the 10th date with her new boyfriend, Josh. Ellie and Laurie help Jules realize that it's ok to be selfish once in a while, when Jules has a disastrous experience in bed with Josh. Meanwhile, Jules left Travis with Bobby, who has to be responsible and deal with his son.
15 year old Amy ends up pregnant after one night at band camp, throwing her whole life upside down. It doesn't help that she's now going to school with that guy.
A slot machine determines the guidelines for the quick-fire challenge; the contestants prepare a special dinner for members of the Macy's Culinary Council.
When the city is attacked, the squad investigates, only to find that a little girl named Brinny Bratten, who had a fractal stuck in her tiara, that gives her a large and terrifying power over reality. The Heroes For Hire are helping the Squad find her father, while Doom plans to use the chaos to his advantage.
Otis is knocked out and wakes believing that he is King Cudenhotep. The only way for him to get back to normal before the farmer comes back is if someone knocks him in the head again, but Otis has beaver guards that prevent others from getting too close to him. When they finally turn Otis back to normal, the farmer see them but get hit on the head believes he is Ben Franklin.
Old Christine finds a suspicious mole on her left breast, and overreacts, thinking shes dying. Meanwhile, Richard tries to negotiate with New Christine regarding their house.
A gang war looms as Silver Sable, Hammerhead and Doctor Octopus vie for a prize that could change the balance of power in New York City's underworld.
Sixty percent of Americans believe in extra terrestrial life forms and one fourth of the general population thinks that aliens have visited the planet. Spurred by this information and a recent influx of reports made by Chilean locals about aliens, Josh and the team embark upon their first ET investigation. Next, a man made international news with his personal footage of an unidentified animal that appeared to be over 40 feet long, floating in Turkish waters. Locals in the city of Van, a far eastern Turkish location, also claimed to have seen the mysterious beast. The story of the Lake Monster has became such a hot topic of discussion that they've built a statue of the monster and formed their own search teams to look for it. Not wanting to miss out on the excitement, Josh and the crew trek 17 hours to join the mission.
Trying to save her job, Frankie organizes a publicity stunt by filling a car with jelly beans. Meanwhile, Sue fails to make the swim team and realizes that she needs glasses and Brick starts reading his mother's romance novels when he can't check books out of the library.
The BAU investigates a case in Rossi's hometown that involves both his personal and professional life.
Phil pushes Jay to go out with him and fly his new model plane. While Manny takes time out to play with Luke, Gloria accompanies Alex in shopping for a dress. Later on, Manny ends up having a heart-to-heart talk with his sister Claire.
Powerful forces are tormenting Ike. He's freaked out and the stress could kill him. Kyle and the boys are doing everything they can to save him but the poltergeists won't leave Ike alone.
When two bodies are discovered at the North and South ends of the city, Mac and the team deftly begin to navigate the trail of evidence left behind by the killer.
When Lily Milton is reported missing, her boyfriend, Parker Hubbard, points Detectives Benson and Stabler in the direction of Callum Donovan, Lily's downstairs neighbor and convicted bank robber who spent nineteen years in solitary confinement. During the investigation into Donovan's alibi, Lily is found alive, adding a surprising twist to the case and exposing more of Donovan's dark past.