Archer is bitten by a snake in a "special place".

The study group goes to the annual Inspector Spacetime Convention; Annie enjoys the luxuries of the hotel; Jeff spends time with an Inspector Spacetime fan (Tricia Helfer) in the bar.

Sherlock investigates a case involving a wealthy philanthropist who believes his incurable illness was given to him on purpose. Meanwhile, Sherlock tries to teach Joan his deductive skills by sending her to a suspicious dry cleaning establishment.

As word of Seattle Grace's financial trouble spreads, Catherine encourages Jackson to move to Boston, and the interns fear they might lose their jobs. Meanwhile, the doctors meet with a potential investor in a last-ditch effort to save the hospital, and Alex impresses Jo while caring for a patient.

Stupid Human Tricks; actor Johnny Depp; musical performance by Bill Carter and The Blame.

Leslie and Ben are getting married, and have to cram months of planning into two hours. Ron's temper gets him in trouble.

Leslie's speech she prepared for a special event is stolen. Ben begins his new job at the Sweetums Charity Foundation. Ann summons the courage to ask an important question.

The latest POI - a deadly government operative who tackles terrorist threats - proves difficult for Reese and Finch to protect.

Olivia and the team are hired by an up and coming politician, Peter Caldwell, but this time instead of fixing a scandal, they're playing high-powered matchmaker. Meanwhile, David is trying to leave the past behind him, but when he feels like he's being followed, he finally turns to the team at OPA for help. Back at the White House, Fitz is still struggling with whom to trust and how to handle a delicate hostage situation, and Jake just won't take no for an answer when it comes to dating Olivia.

Harvey’s vision for the firm’s future clashes with Jessica’s when a British firm offers a tempting proposition.

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

A rumor links Chuck Hagel to a made-up Islamic group, for-profit incarceration teams up with football, MTV cons BET Twitter fans, and Lil Buck explains jookin.

From "The Big Bang Theory", actor Kunal Nayyar; actress Molly Shannon.

When Stefan arrives back in Mystic Falls with Elena and Jeremy, Caroline is immediately worried about Elena’s state of mind. Stefan reaches out to Dr. Fell and Matt for help. Still on the island, Damon relays somber news to Rebekah, and is surprised at her reaction. Together, Damon and Rebekah learn an unexpected bit of recent history from Vaughn. Everyone is horrified when Bonnie reveals the rest of Shane’s plan. Finally, after Damon does his best to help her, Elena comes up with a plan of her own.