Sherlock and Watson consult on a child abduction case involving a serial killer who is nicknamed "The Balloon Man," because he leaves a signature batch of balloons at each of his crime scenes.

The survivors from the crash are asked to make an almost impossible decision that will affect the rest of their lives. Meanwhile, tension grows between Jackson and April after they're forced to work together, and Alex tries to restrain himself with one of the interns.

With the garbage men of Philadelphia on strike, Frank concocts a plan to undercut the union and get the contract to collect the city's trash.

An STD outbreak amongst Pawnee seniors prompts Leslie to conduct a sex education class. Ron helps Tom adjust to life without technology. Ben and April meet Congressman Murray for the first time.

Reese protects the spoiled daughter of a Brazilian diplomat.

A paranoid government official drops a bombshell on Pope & Associates and even Olivia is caught off-guard with how high up this Scandal goes. Back at the office, unresolved questions about Quinn's background create tension amongst the associates. Meanwhile, despite Cyrus' best efforts to keep a lovesick President under control, things still manage to heat up between Fitz and Olivia when Olivia's old flame returns.

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

A squirrel votes for Mitt Romney, a farmer puts candy in cow feed, Stephen reports on the world's only Corn Palace, and The Killers discuss their clean-cut reputation.

From "Boss," actor Kelsey Grammer; from "Happy Endings," actress Casey Wilson; comic Ben Hague

Kevin and Jenny argue over whether or not their son will be circumcised and everyone takes sides, including Shiva.

The staffers hit the road in a rented bus when the building is deemed unsafe. Meanwhile, Nellie reaches out to Andy for help in adopting a baby, and Jim uses pie to spread cheer to Pam.

Elena tries to cope with the extreme highs and lows that are part of becoming a vampire, and Stefan and Damon almost come to blows while arguing about what is best for her. Damon decides to help Elena in his own way and asks her not to tell Stefan. A stranger, Connor Jordan, arrives in town and begins questioning Sheriff Forbes and Mayor Lockwood. Connor’s actions quickly convince Stefan that they are dealing with a dangerous vampire hunter. Jeremy and Matt are surprised to see a girl they used to know, April, has returned to town and is enrolling at Mystic Falls High. At a town gathering, Elena comes close to losing control until Caroline steps in to help her. Finally, Damon confides his feelings to an unexpected friend.