Neal and Peter race against a criminal mastermind to unearth an invaluable treasure hidden in New York.

As Annie prepares the cafeteria for the midterm dance, she and professor Hickey must deal with the head custodian, the head of IT and the head of parking.

Arrow offers to train Roy so he can learn to control his newfound super-strength. However, Roy is a rebellious student and refuses to listen unless Arrow reveals his true identity, which Oliver refuses to do. Meanwhile, the Bronze Tiger escapes from prison and steals Malcolm’s earthquake machine to sell to the highest bidder. Oliver, Diggle and Felicity attempt to stop the transfer, but Roy gets in the way, putting everyone in danger. Laurel is disbarred and spirals out of control. Moira is thrilled when Walter asks her to dinner, but his reason surprises her. Thea encourages her mother to ask Walter to reconcile.

Monroe leads Connor and Charlie on a risky mission, as Miles and Rachel keep an eye on things in Willoughby. Meanwhile, Neville gets a new assignment and Aaron reunites with an old friend.

On the 200th episode, The Mother recounts how she met Ted and what she’s been up to for the past eight years.

Riley and Gabriel go on a covert mission in Syria in order to rescue American journalists being held hostage; the truth about Riley’s past with her ex-boyfriend is revealed when they are forced to work together.

A hidden image at the burned-out church leads Cohle and Hart to Joel Theriot, a tent-revival minister whose parishioners finger a scarred “tall man” seen with Dora Lange. Brought in for interrogation, a sex offender matching the description is quickly dismissed by Cohle, despite offering a confession. Hart gets sidetracked after Maggie sets Cohle up with a friend at a C&W bar. Looking to establish a pattern of murder, Cohle pores over old case files, finding a connection with a woman assumed to have drowned years earlier.

Marty and Jeannie pit rival grocery clients against one another, but things don’t go quite as planned. Meanwhile, changes at Galweather cause trouble for Jeannie; and Clyde’s already difficult work situation under Monica becomes even more brutal when he is forced to work from her home.

When a corporate espionage case has personal ties to Neal, Peter recruits Diana from maternity leave for an undercover sting on a rogue stock trader.

Abed plans an epic going-away party as Troy prepares to leave Greendale; a fun game transforms into a high-stakes competition.