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.
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.
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.
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.
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.
Picking up months after the Singularity attacked Central City, Barry is still struggling to forgive himself for Eddie’s death. Concerned about putting his friends in danger, Barry has pushed everyone away and has chosen to protect the city on his own. When a meta-human named Atom Smasher attacks the city, Iris tells Barry that he needs to let his friends help him protect the citizens of Central City. Meanwhile, Cisco helps Joe with his Meta Task Force.
When the body of a local college fraternity student is found gruesomely murdered, Castle has to go undercover as a professor in order to gain access to the victim’s world. However, he and Beckett soon discover that behind the fun and games of college are some darker secrets the university wants to keep hidden.
As Alicia tries to revive her struggling law career, attorney Lucca Quinn becomes her competition; Peter engages Ruth Eastman, a new strategist for his campaign, changing the dynamic with Eli in the process.
Almost two years after the Embassy attack in Islamabad, Carrie is building a new life in Berlin. But her peace is threatened when a request from her boss forces her towards the dangerous world she left behind.
Kiera pressures Carlos for more time; Kellog faces unexpected danger; the future soldiers plan a raid.