Archer and Lana head to Louisiana to stop an ecoterrorist from blowing up a natural-gas pipeline. (Archer’s also looking forward to a Big Easy vacation.) Back at ISIS headquarters, Mallory orders the staff to go green to get “freebie socialist tax credits.” A flashback recalls Lana’s introduction to ISIS.

The liquefied remains of a wedding planner are found in her home tanning bed on Valentine’s Day, and Cam pressures her team to solve the case in time so she can celebrate the holiday with her boyfriend. While the “squints” works tirelessly in the lab, Booth and Brennan interrogate a slew of possible suspects until they unlock classified files in the victim’s computer, which lead to their main suspect. Meanwhile, Booth and Brennan downplay the significance of Valentine’s Day, and Hodgins tries to plan a romantic day for Angela, but “squint” Clark helps him realize that the most meaningful gifts come from the heart.

When Pierce lands in the hospital, he believes he's dying and gives the study group specific gifts that are actually meant to torment them. Britta wonders what to do with a blank check for "charity," Jeff ponders the idea of meeting his father, and Troy gets to meet LeVar Burton, while Abed films the whole thing for a documentary.

Jason McCann contacts Nick and says that he's in imminent danger. Langston has a courtroom war of nerves against serial killer Nate Haskell. A bomb tech disarms a bomb attached to Nick's house. But when he accompanies Nick, Catherine and Vartann to a warehouse with multiple booby-traps per square inch, Kip has to really earn his paycheck to find a safe way out for the CSI team.

Meredith, looking to prove she is Chief Resident material, learns that anything and everything can happen in an hour's time when she steps up to run the ER for a night; meanwhile, Bailey sneaks off with Eli and gets into a little mischief, and everyone is surprised when the Chief's wife, Adele, shows up as one of the ER patients.

Paris Hilton, Nathan Fillion, Scissor Sisters

While advertising for the Harvest Festival, Ben has to deal with some troubling questions about his past. Meanwhile, Andy continues to try to win April back.

A woman who left a high stress lifestyle and moved to the Hamptons can't seem to relax but Hank has a medical explanation for her.

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

Stephen poses for Project, and Jeffrey Leonard calls out big companies' late payment policies.

Episode info coming soon ..

When a modern-day prospector is found dead near a mining site and Lisbon is injured during the initial stages of the investigation, Agent Hightower joins Patrick Jane in the field for the first time.

Michael screens his action film Threat Level Midnight to the office after eleven years of writing, shooting, re-shooting, and editing. The film features Michael as Agent Michael Scarn, Dwight as Scarn's sidekick, and Jim as archnemesis "Goldenface," as well as several people from Michael's past.

Stefan tells Elena about a dark time in his history and the surprising person whose influence changed everything. After getting the truth out of Luka, Jonas makes his feelings clear to Bonnie and Jeremy. Trying to catch Elijah off-guard, Damon arranges a dinner party for him with Jenna, Alaric and Andie, but last-minute information throws Damon’s plan into chaos.