Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang.

When the star of Castle’s favorite ‘80’s action movie is mysteriously murdered, Castle and Beckett delve into the victim’s secret past and pursue his killer with help from a team of aging action heroes.

Jane and Lisbon begin their new relationship, but they must hide their feelings for each other from their colleagues as they investigate the murder of an undercover agent. Also, young, ambitious agent Michelle Vega joins the team.

For his fortieth birthday, Henry requests that Eliza find him a meaningful gift, but when she buys him tickets to see his favorite band, it creates tension between Henry and Julia, the woman he’s seeing.

The Flash goes up against Farooq aka Blackout, a metahuman who can harness electricity. During their battle, Farooq zaps The Flash and siphons all his electricity, leaving The Flash without his speed. Dr. Wells, Caitlin and Cisco work to reverse the effects on Barry, but their efforts are disrupted when Farooq comes banging on S.T.A.R. Labs doors in search of Wells, who he blames for his accident. Without Barry’s powers to protect them, the group must figure out a way to save themselves from the metahuman. Meanwhile, Tockman manages a coup inside the Central City police department and takes several people hostage, including Joe and Iris. While Iris is sure The Flash will save them, Eddie has a trick up his sleeve.

When subway passengers, including Detective Esposito, are taken hostage by a mysterious gunman, Castle, Beckett and the team must uncover the gunman’s agenda before it’s too late.

When subway passengers, including Detective Esposito, are taken hostage by a mysterious gunman, Castle, Beckett and the team must uncover the gunman’s agenda before it’s too late.

When Cary’s case goes to trial, a plea deal offer has him seriously considering jail time. A joke between mother and daughter lands Alicia in trouble as her campaign for State’s Attorney is in full stride.

Carrie improvises to salvage her mission. The CIA closes in on a leak.

Neal is conflicted over scamming an innocent mark; Peter works with an audacious Interpol agent who could jeopardize their operation.