Things get complicated when Harvey mixes business with pleasure and gets caught between Jessica and Scottie. Painful memories plague Mike as he uses a case to exorcise demons against an old foe, while Louis’ suspicions threaten to expose Mike.
After arguing with Sheldon, Howard tries to make amends by taking him to NASA headquarters in Houston. Penny has second thoughts about quitting her waitressing job when her car dies. Amy gets involved in trying to find Raj a date.
After an anonymous complaint is issued by one of their own, the hospital implements a non-fraternizing policy causing the couples to panic. Meanwhile, Emma and Owen talk about the future, Cristina and Meredith enjoy a little girl time, and Richard enlists the residents to help research a rare cancer case.
Nadia recalls her centuries-long search for her mother. Stefan, Caroline and Matt come up with a desperate plan to save Elena's life. Damon baits Tyler into an ugly confrontation and seeks revenge against Dr. Wes. Bonnie learns a terrifying secret that threatens the lives of all her friends.
The British Foreign Office, led by foreign secretary Sir Edward Grey, receives news of an assassination in the Balkans. In Berlin, the kaiser thinks he can exploit it for his own advantage.
Determined to cover up the truth by any means necessary, Harold's sworn duty to protect and serve suffers in the aftermath of the accident.
A lightning strike at a church picnic gets the guys to start thinking about how there’s no justice in sickness and injury, because like it or not, the “rain falls equally on the just and the unjust.” After a discussion of karma, the guys volunteer to teach CPR to disadvantaged kids only to later be given killer Bears tickets for the same day they’re supposed to teach.
Janet is overwhelmed with guilt about Blakely's death, and Det. Campbell believes his demise could have something to do with an old case; Erin and Owen are preoccupied with a bikie murder.
Walden thinks his girlfriend is cheating on him; Alan starts dating Larry's sister, Gretchen (Kimberly Williams-Paisley).
Harry, Michelle and Zoey dole out conflicting love advice to Billy, while Harry tries to deal with his newly discovered crush on Rose. Meanwhile, Rose can't wait to start dating a cute father at her baby's play group, but she’s not happy when she finds Harry spying on her date. Jonathan is thrilled to come to Harry's rescue, since Janet and Anastasia aren't interested in his advice.
Holmes and Watson consult on a case in which a man suspected of murdering his wife years ago receives a ransom demand for her safe return. Meanwhile, Lestrade overstays his welcome at the brownstone and seems unwilling to leave.
Mary must decide whether to marry Bash or Francis, who returns accompanied by Lola. Meanwhile, Mary's mother visits and pushes her own agenda, and her mere presence in the castle troubles both Henry and Catherine.
The All-Stars face the Boot Camp from Hell as they struggle to survive the harshest obstacle course ever.
An outspoken and self-destructive criminal defense lawyer takes on the most challenging cases.
Alvin reveals he trained the Screaming Death to attack Berk and destroy the island's inhabitants and only Snotlout and Hookfang can save Berk before it's too late. Meanwhile Hiccup gets ready for a final fight against Dagur to save Toothless and end the barbarians invasion of Berk once and for all.
Mel gets a reluctant Joe to agree to couple’s therapy to work on their constant arguing. But she’s completely caught off guard when the therapist turns out to be Joe’s ex-girlfriend. Meanwhile, Lennox is conflicted about dating her Teaching Assistant after Zander shows up on her porch.
Tori gets evicted from her apartment while Taylor films a music video. Kolby doesn't want to follow in her preacher parent's footsteps and Megan sneaks out to a lake party.
Shawn and Gus are bummed to find out the owner of their favorite food truck has been murdered. The two of them go undercover to learn the food truck ropes and find out who the killer is. While working on the case, Marlowe visits them to cure a pregnancy craving and goes into labor at the most inconvenient time.