The fantastic voyage concludes.

When an affluent school teacher is found dead in an abandoned bookstore, the teachers and students at her school become suspects in the case. Meanwhile, Brennan’s publisher encourages her to join Twitter to help grow her fan base, and “squintern” Jessica Warren (guest star Laura Spencer) teaches Brennan some tricks to master the Twitter-verse, skills Brennan enthusiastically puts to use.

When a driver for a ridesharing company is intentionally run over by a city cab, Holmes and Watson wonder if it’s a case of professional jealousy. A casual romance Holmes has with one of his longtime “Irregular” consultants becomes complicated when the woman makes a shocking request.

A school field trip to the hospital takes a dramatic turn when the kids witness two injured cops enter the emergency room. Meanwhile, Stephanie sets her eyes on one of the chaperones, Callie operates on the leg of the police captain and Amelia must face her feelings for Owen.

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Mordecai and Rigby have to get a new garage door for the house, but get lost in a massive warehouse store trying to get it.

David tries to recruit former B613 agents to strengthen his case. Meanwhile, a congressman asks Olivia to help his father escape his looming death penalty.

When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Doctor Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.

The task force tracks a provocative female Blacklister, a frame-up artist who targets the wealthy elite. Tom pleads for Liz's help. Red pressures Liz for the Fulcrum, claiming it's now a matter of life and death.

First Lady Michelle Obama; Matthew Morrison (Broadway musical "Finding Neverland"). Also: Smashing Pumpkins perform.

The appearance of the Viking fleet causes panic among the population of Paris. The Emperor Charles, urged by his daughter Gisla, announces in Court he will remain in the city. The defense of Paris is in the hands of its Commander, Count Odo, who hopes that a heroic victory against the Vikings will gain him Gisla’s hand in marriage. The Vikings establish camp downriver from the city and plan their attack.