Barry and Iris struggle with the arrival of their daughter from the future -- a fellow speedster who is unable to return home to her time, but eager to help out. While the team battles a new metahuman villain, they must also prevent Nora from changing history any more than she has.

A woman with the power to compress air molecules goes after a cache of high-tech weapons -- while a shadowy new foe begins attacking metahumans in Central City. Meanwhile Nora trains to become a better speedster, and Caitlin and Ralph try to help Cisco get over a broken heart.

Team Flash recruits a super-detective version of Wells to help track down Cicada, unaware that the metahuman serial killer has set his sights on Cisco. Caitlin and Ralph visit her mother's company to investigate the mystery behind her father's death certificate.

Iris's competition in the blogosphere starts creating her own stories through mental manipulation, creating problems for XS and the Flash to solve. Ralph and Sherloque go in search of a new lead on Cicada.

Barry and Iris investigate a creepy contortionist meta who is targeting the city's elite. Caitlin's friends help her follow a clue that leads her deeper into her father's past -- and a new connection to Killer Frost.

With the rest of the team searching for clues to Cicada's whereabouts during the satellite explosion, Barry and Cisco help Caitlin recover her father from a distant black site. But Cisco grows suspicious that there is more to the situation than a family reunion.

Barry comes close to discovering Cicada's identity, prompting Orlin Dwyer to remember how young Grace came into his life. Meanwhile the team faces off against another meta who can control the weather, and Nora struggles with her father's loss in the future.

Barry and Nora embark on a risky plan to stop Cicada by traveling to key moments in the past, gathering pieces of a weapon to use against him -- putting them face-to-face with the Flash's most dangerous enemies.

After Barry Allen and Oliver Queen wake up to find that they are living one another's lives they turn to Kara on Earth-38 for help. Meanwhile Team Flash tangles with Amazo -- a killer robot that can absorb and use metahuman powers.

As Cecile's prosecution of Weather Witch moves forward in court the Flash pursues a car thief armed with meta tech -- who is determined to recruit her fellow rogue. Cisco discovers a potential way to cure meta-humans.

Nora is severely injured in a fight with Cicada, leaving Barry determined to end his enemy once and for all. As the team works to help a group of metahumans on Cicada's kill list to escape into hiding, Killer Frost and Caitlin have a disagreement over the potential metahuman cure.

Nora panics at the prospect of her secret being found out, and enters the mind of young Grace alone to try and help the girl wake up. When things go wrong, Barry and Iris follow her in.

Barry and Ralph go undercover inside a the organization of a criminal weapons dealer, only to find themselves forced to join an illegal op. While Nora tries to distract Sherloque by distracting him with his love life, Iris finds herself face-to-face with Orlin Dwyer.

With Barry sidelined Nora faces a deadly crisis, looping the same hour over and over again to prevent Cicada from killing the people she loves.

The team hopes to offer King Shark a chance to return to his human life -- and the woman he loves -- by testing the metahuman cure. But a newly empowered Grodd disrupts their plans, setting up an epic showdown in the streets of Central City.

Barry determines to offer Orlin Dwyer the chance to take the metahuman cure and change his future, but first the team must find a way to find him. Joe welcomes Cecille's help as he returns to work, and the two quickly zero in on Dr. Ambres and what she really knows about Cicada.

As Dwyer wakes up to discover the identity of his savior, Nora wrestles with her need to come clean with her family about the secrets she has been keeping. As the team tracks the new Cicada, they discover that she has a personal agenda of her own.

After discovering Nora's secret alliance with an enemy, Barry and Iris turn to her journal to learn more about the path that brought their daughter into their lives from the future -- including Nora's discovery of her powers, and her encounter with a new and powerful speedster.

Barry's unilateral decision about Nora creates tension on Team Flash, sending her back into the arms of Eobard Thawne. When Icicle returns in the body of Caitlin's father to steal a piece of technology, Caitlin and her mother are forced to resolve their personal issues to stop him.

Barry and the team must go up against a fellow speedster when Nora recruits a team of criminals to steal meta tech. Meanwhile Caitlin and Ralph head to her father's arctic research outpost to investigate a signal.

With Cicada II on the verge of unleashing a virus that could threaten all metas in the city, S.T.A.R. Labs and the C.C.P.D. offer the meta-human cure to the public. Meanwhile Sherloque comes to the aid of Renee Adler, and Nora discovers that she has a connection to the enemy.

After Ralph sacrifices himself to stop the destruction of Cicada's dagger, Team Flash discovers the weapon's connection to Barry's oldest foe -- the Reverse Flash. But they must locate Grace before she travels even further back in time.