Van Pelt's actions are called into question when a witness is murdered while she is assigned to his protection.
Tom tries to get back at Ron by going out on a date with Ron's ex-wife Tammy, while Leslie tries to protect Ron from falling prey to her charms. Meanwhile, April is assigned to work with Chris.
Todd leads anger-management training to improve the staff's customer-service skills, but he's surprised to learn that Gupta is in need of the most help. Elsewhere, Madhuri receives a Valentine's Day gift from a secret beau.
Stefan and Elena get away for what they hope will be a romantic weekend at the Gilbert family lake house, not realizing that they’ve been followed. Jenna starts to worry that Alaric isn’t being honest with her. Jules explains the importance of the sun and moon curse to Tyler, but leaves out an important detail. Damon attends a tea at the Historical Society in order to talk to Elijah, but Elijah isn’t giving up any secrets. With help from Caroline and Jeremy, Bonnie uses deceptive measures to get shocking new information out of Luka. Finally, Tyler offers Matt some relationship advice.
Mini is under threat. When Grace brings Franky into the charity fashion show, Mini sacks them both, and re-imagines the show in her own image to cement her power.
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
On Valentine's Day, Troy and Abed compete for the attention of an assistant librarian, while Britta tries to show she's open-minded about lesbians.
A BMX rider’s remains are discovered on the roof of a warehouse after a failed bike stunt. While Booth and Brennan interrogate the victim’s fellow riders, Hodgins and newly mellowed “squint” Fisher identify the numerous fractures in the victim’s skeletal structure, and Angela recreates the series of events that led to the fatal accident. Meanwhile, Sweets turns to Booth for advice about his relationship with Daisy, and Booth makes a decision about his relationship with Hannah.
The staff grows increasingly uncomfortable with Michael and Holly's PDAs. Jim and Pam regret a champagne luncheon. Andy horns in on a romantic treasure hunt Gabe arranged for Erin.
The Crime Scene crew investigates the gruesome murder of a high-powered, widowed lawyer, while Ray faces that it is time to move on from his old life.
Jack and a very pregnant Avery take a romantic break in Canada. When Avery goes into labor, the power couple desperately scramble to not give birth to a Canadian. Meanwhile, Liz's getaway with Carol gets grounded, literally, when their plane collects dust on the tarmac. And Tracy is an EGOT winner, but with that comes overwhelming demands.
Charlotte's attacker, Lee Henry, arrives at St. Ambrose Hospital, injured by his girlfriend and in need of urgent care, and Sam and Charlotte must decide whether or not to save his life. Meanwhile, Susan's health takes a turn for the worse, and Addison's mother, Bizzy, begs her daughter to do everything in her power to help.
When the Octopod's waterworks are flooded with frightened Humuhumu fish, the Octonauts have to find a way to flush them out.
Ryan intercepts information about a dangerous new weapon coming into the U.S. and asks Nikita to help him prevent its delivery. Nikita learns that the man bringing the weapon into the country is Voss, a man Division forced her to have a relationship with while working undercover. She reluctantly resumes her alter ego to prevent the weapon from being delivered. Meanwhile, Michael interferes with Alex's relationship with Nathan.
The team attempt to track a giant, underground insectoid predator from the future, and there is something about the creature that Matt isn't telling the team. Meanwhile, Philip shows Connor the true purpose behind New Dawn, and Abby becomes more suspicious of Matt and grows closer to discovering his secret, while Lester struggles at the ARC to make a good impression to Ms. Reece of the Cabinet Office for a knighthood.
After a year with the gang unit, Detective Kevin Ruggiero returns to Miami Homicide, investigating a drive-by shooting that left two men dead. He has little to work with until he learns that one of the victims was a founder of a local gang. Then in Louisville, Detective Kristen Downs responds to the shooting of a 17-year-old boy. When she learns that his friends witnessed the shooting, she has to convince them to overcome their fear of retaliation in order to bring him justice
When a park ranger is hit by lightning, Hank is able to save his life. Now the ranger wants to recapture the experience.
From lush cloud forests to bare summits, many people make their homes in the extreme altitudes of the world's mountain ranges. Explore the extraordinary ways life is sustained in this world of thin air and few resources.
Ed and Rosemary's fledgling relationship hits a snag when she tells him that his gun has got to go. After Henry, Vince, and Bonnie convince him to heed her wishes, however, Ed's house gets robbed and he's helpless without his firearm. While Ed tries to get Rosemary to reconsider, Vince and Bonnie attempt artificial insemination.