Still feeling responsible for Eddie's death, Barry pushes his friends away and tries to protect the city on his own; Cisco assists Joe with the Meta Task Force.
A mysterious man has a warning about an evil speedster intent on destroying The Flash; a determined officer wants to join Joe's meta-human task force.
Barry and the team ally with the kidnapped Captain Cold's sister, but Barry feels duped when he learns Snart is working on something with his father; Joe faces a difficult decision.
Barry and the team search for another partner for Dr. Stein; Iris leaves Joe feeling surprised; Patty and Barry become closer.
Barry sets off to capture a new breacher who has come through the portal, but Jay tries to tell him she's not a threat; Barry and Patty go on a date.
Barry forms a dangerous plan to defeat Zoom; Iris not only supports Barry's idea, but supplies a surprising ally.
Barry races to rescue Caitlin when Grodd kidnaps her; Cisco plans a date with the new barista at Jitters; Patty thinks Barry is hiding something.
When Vandal Savage attacks Kendra Saunders, Barry takes Kendra to Star City, seeking Oliver's protection; Harrison asks Jay to test a new serum to make Barry run faster.
The Weather Wizard returns to break Captain Cold and the Trickster out of Iron Heights, leaving Barry to stop the trio from taking over Central City during the holidays; Joe and Iris meet Wally West.
Barry wants to tell Patty that he is The Flash; Joe and Iris get to know Wally; the team pursues a meta-human capable of slowing time down.
An attack at Mercury Labs confirms that the Reverse Flash has returned; Iris and Francine share a moment that brings Iris closer to her brother.
Barry and Wells have an encounter with a meta-human known as Tar, who can turn into liquid asphalt; Iris is worried about Wally after learning about his hobby.
Barry, Wells and Cisco travel to Earth-2 to save Wells' daughter from Zoom, where Barry is shocked to meet Killer Frost and Deathstorm; Jay takes over the Flash's responsibilities when meta-human Geomancer attacks the city.
While on Earth-2, the team receives help from a surprising source as they search for Zoom's lair; on Earth-1, Caitlin works to perfect Velocity-9 so Jay can vanquish the Geomancer.
When King Shark escapes from an A.R.G.U.S. holding tank, Diggle and Lila go to Central City to warn The Flash; Joe, Iris, Wally and Barry are attacked.
When Barry and the team decide to have a night on the town, they encounter a speedster with bad intentions; Iris gets a challenging assignment from her new boss and is caught off guard when their conflict turns to flirtation.
After discovering the true identity of Zoom, Barry is more determined than ever to stop him; to increase his speed, Barry goes back in time to look for help from an arch nemesis.
Barry wants to use a tachyon device to open the breaches in a plan to catch Zoom; Hunter Zoloman's past on Earth-2 is revealed.
A meta-human named Griffin Grey kidnaps Harry, mistaking him for Earth-1 Harisson Wells, and demands a cure for his condition.
Back on Earth-1, Zoom is intent on taking over Central City; Barry and Wells devise a dangerous plan to stop Zoom for good; Barry reaches out to both fathers for advice.
Iris volunteers to act as the bait in a plan to trap Girder (Greg Finley) in S.T.A.R. Labs; Barry struggles to go back to his old life.
Zoom unleashes an army of Earth-2 meta-humans, the leader of which is Black Canary's doppelganger, Black Siren; Joe worries when Wally goes out to help The Flash.