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.

Haley turns the tables when Claire and Phil try to talk with her about her future; Jay receives news from his friend Shorty; Cam and Mitch go on a romantic date.

Oliver is conflicted after Laurel reaches out to the Arrow asking him to investigate Sebastian Blood. Oliver is unsure whether to believe her accusations against the man he has publically supported for mayor, but decides to trust Laurel. However, when the pair gets too close to the truth, Sebastian exposes Laurel’s drug addiction and has her arrested. Meanwhile, Roy reveals his new super-strength to Sin who wants to test out his abilities. Unfortunately, Roy isn’t able to contain his rage once unleashed and almost kills a man. Back on the island, Oliver is surprised when Sara reveals a secret about Laurel.

Principal Barker (Rachel Dratch) asks the parents to form carpools while the bus drivers are on strike; Axl becomes an astronomy expert so he can tutor an attractive student; Mike receives two tickets to a basketball game.

When Gene decides to assist the town of Willoughby, Rachel and Charlie feel compelled to help too as Miles and Monroe continue to join forces in order to survive.

When a rising young pop star is found dead in an alley, Castle and Beckett delve into the victim’s out-of-control hard-partying lifestyle, but as they dig deeper, a shocking revelation threatens to rock their investigation.

When Barney drinks too much, Ted and Robin take advantage of him and get him to reveal secrets he’s been hiding for years. Meanwhile, Marshall does everything he can to avoid fighting with Lily.

Gabriel’s chip is hacked, leading to him discovering that Mei Chen is still alive and that she possesses a chip even more powerful than his own.

Marty has a confusing meeting with Roscoe’s new crush; Jeannie makes some power moves to win an account with the Department of Defense; Sarah tells Doug that she wants them to have a baby; Clyde witnesses Monica push a junior analyst a bit too far.