Jay Garrick, a mysterious man from Earth-2, appears at S.T.A.R. Labs with a dire warning about an evil speedster named Zoom, who is set on destroying The Flash. Barry and the team must decide if they can trust this stranger even as they face yet another powerful meta-human. Meanwhile, Joe must deal with a determined officer named Patty Spivot who wants to join his meta-human task force.
News
What Lies Beneath
When Castle's idol, a famously reclusive author, turns up dead, Castle is determined to solve his hero's murder. But as he and Beckett dig deeper, they discover that truth is stranger than fiction.
The Tradition of Hospitality
Carrie and Düring visit a refugee camp. Saul and Allison are at odds. Quinn stays on mission.
Innocents
Alicia argues a complex museum vandalism case that involves photographs taken by a mother of her son, and considers enlisting the help of investigator Jason Crouse. Meanwhile, Cary deals with inappropriate conduct towards some younger associates at the firm by partner Harold Lyman.
Final Hour
Series Finale: Kiera and Alec risk everything to stop the future soldiers and their devastating plan. Kellog, despite a loose alliance with Kiera, has plans of his own. All factions clash violently in order to determine which path the future will take.
The Needs of the Many
In search of someone from his past, Noah breaks in to Renautas for answers. Miko continues her rescue mission and travels in search of her sword. Tommy must use his ability to save the life of someone close to him. Luke comes up against unexpected obstacles in his relationship with his wife. Carlos takes major steps forward in his heroic journey.
The Closet Case
Mitchell takes a job with a rival of Jay’s; Luke and Manny visit Alex but use the opportunity to meet girls; Gloria is upset when a cheerleader doesn’t decorate Manny’s locker; Phil and Claire try to play chicken when Dylan moves in.
Green Arrow
Oliver and Felicity’s blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by “Ghosts,” assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn’t want Oliver on the team.
The Legend of Marcos Ramos
When Brian helps Agents Harris and Boyle investigate the murder of a retired FBI agent, they’re shocked to find a link to the elusive head of a notorious drug cartel. Also, Brian reconnects with an old flame, Shauna but worries her renewed interest is really in the NZT version of him.
Purpose in the Machine
Fitz and the team enlist the aid of an Asgardian to unlock the secrets of the ancient monolith that swallowed Simmons, and Agent May is at a crossroads in her personal and professional life.