City Of Heroes Barry Allen was just 11 years old when his mother was killed in a bizarre and terrifying incident and his father was falsely convicted of the murder. With his life changed forever by the tragedy, Barry was taken in and raised by Detective Joe West, the father of Barry's best friend, Iris. Now, Barry has become a brilliant, driven and endearingly geeky CSI investigator, whose determination to uncover the truth about his mother's strange death leads him to follow up on every unexplained urban legend and scientific advancement that comes along. Barry's latest obsession is a cutting edge particle accelerator, created by visionary physicist Harrison Wells and his S.T.A.R. Labs team members, Caitlin Snow and Cisco Ramon, who claim that this invention will bring about unimaginable advancements in power and medicine. However, something goes horribly wrong during the public unveiling, and when the devastating explosion causes a freak storm, many lives are lost and Barry is struck by lightning. After nine months in a coma, Barry awakens to find his life has changed once again - the accident has given him the power of super speed. Thrilled with his new powers, Barry learns how to control them with the help of Dr. Wells and his team. However, keeping his secret from his best friend Iris is proving to be harder than he thought, especially when Joe's new partner, Eddie Thawne, catches her eye. When another meta-human attacks the city, it's time to put Barry's new powers, and himself, to the test.
Fastest Man Alive Barry escorts Iris to a university gathering honoring scientist Simon Stagg. When six gunmen storm the event, Barry changes into The Flash and tries to stop them. While he does save a man's life, he passes out before he can capture the robbers, which frustrates him. As Dr. Wells, Caitlin and Cisco scramble to find out what's wrong with Barry, Joe comes down hard on Barry for taking the law into his own hands and risking his life. Barry realizes that it wasn't six gunmen but a metahuman named Danton Black, who can make multiples of himself. Meanwhile, Iris becomes even more intrigued by the red streak.
Things You Can't Outrun As Barry and the team at S.T.A.R. Labs work to capture Kyle Nimbus, a.k.a. The Mist a dangerous new meta-human with toxic gas powers, they revisit the painful night the particle accelerator exploded and killed Caitlin's fiance, Ronnie. Meanwhile, Joe decides to finally visit Henry in jail after all these years, but things take a dangerous turn when Kyle shows up looking to punish Joe for arresting him years ago. Meanwhile, Iris and Eddie continue to hide their relationship from Joe.
Going Rogue The Flash stops a robbery but the culprits get away after shooting a guard, and The Flash chooses to save the man instead of following the criminals. Joe shows Barry a book of suspects and Barry identifies Leonard Snart as the leader of the group. While investigating the case, Barry gets a surprise visit from an old friend - Felicity Smoak, who heard about his new abilities and came to check them out for herself. She joins him at S.T.A.R. Labs to help stop Snart after it's revealed that Snart his gotten his hands on a stolen cold gun, which could kill The Flash. Dr. Wells is furious when he finds out that Cisco built the cold gun without telling anyone and now it's missing. Meanwhile, Iris is getting the silent treatment from Joe because of her relationship with Eddie. Finally, The Flash and Captain Cold have an epic confrontation.
Plastique After a bomb goes off downtown, the army led by General Eiling rolls in and takes over the case, much to Joe's surprise. Suspicious, Joe tells Barry that he and his friends at S.T.A.R. Labs should look into the army's involvement. Wells informs the team that Eiling was experimenting on his men to turn them into super soldiers. Cisco confirms one of Eiling's soldiers, Bette Sans Souci, was at the bomb site. The Flash tracks her down and realizes that she's not setting off the bombs, she is a meta-human who can blow things up just by touching them. Meanwhile, when Joe learns Iris is writing about the streak, he tells Barry to make her stop. Barry realizes Iris won't listen to him so he decides to have The Flash pay her a visit.
The Flash Is Born The Flash faces a new meta-human named Tony, who can turn himself into girded steel at will. While Dr. Wells and Caitlin are concerned about Barry's safety, Cisco comes up with a plan to take Tony down. Meanwhile, Iris's blog on The Flash gets her into trouble, and Eddie witnesses Tony's abilities firsthand and begins to ask questions that Joe doesn't want answered. Joe asks Dr. Wells to help him solve Nora Allen's murder.
Power Outage 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.
Flash vs. Arrow Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang. Excited about teaming up with his friend, Barry asks Oliver if he'd like to help him stop Ray Bivolo, the meta-human Barry is currently tracking. Bivolo causes people to lose control of their emotions and has been using that skill to rob banks. Unfortunately, the superhero partnership doesn't go as smoothly as Barry expected. When Oliver tells Barry he still has a lot to learn, Barry sets out to prove him wrong by attempting to stop Bivolo alone. However, when Bivolo infects Barry and sets him on a rage rampage, everyone is in danger, and the only one who can stop him is the Arrow. Meanwhile, Iris is furious when Eddie tries to get a task force to stop The Flash, Joe and Dr. Wells agree the Arrow is a bad influence on Barry, and Caitlin and Cisco deal with a new team in S.T.A.R. Labs.
The Man In The Yellow Suit Barry finds himself face-to-face with his nemesis, the man in the yellow suit, a.k.a. Reverse Flash, who killed his mother. Barry is frustrated when the Reverse Flash escapes, but Dr. Wells and Cisco come up with a plan to trap him. All they need is bait, so they turn to Dr. Tina McGee from Mercury Labs to help. Meanwhile, it's Christmas at The West household and Iris is in full holiday cheer. Eddie gives her a surprising gift but also leaves her with a question that could change her life. Joe joins the search for the man in yellow and ends up in the crossfire. Caitlin finds Ronnie.
Revenge Of The Rogues Leonard Snart AKA Captain Cold returns to Central City with a new hotheaded partner in tow - Mick Rory AKA Heat Wave. The duo plan to steal a multi-million dollar painting, but Cold has another agenda while in town - to set a trap for The Flash. Snart and Mick kidnap someone close to The Flash and threaten to kill them unless The Flash shows up for a battle of fire and ice. Barry tells Joe he isn't sure he should take on Snart again after the casualties that happened the last time they fought. Meanwhile, Barry asks Dr. Wells, Caitlin and Cisco to help him double his training efforts so he's ready for the Reverse Flash when he returns to Central City. Iris deals with the aftermath of Barry's confession, and Cisco makes the CCPD a new shield.
The Sound And The Fury Dr. Wells' former protegee, Hartley Rathaway, returns to seek revenge on his mentor after being affected by the particle accelerator explosion. Now able to manipulate sound waves, the brilliant Rathaway is a dangerous threat to both Wells and The Flash. Meanwhile, Iris is thrilled when she's hired by the Central City Picture News as their newest cub reporter. Unfortunately, her editor pairs her with a veteran reporter, Mason Bridge, who wants nothing to do with her. Cisco recalls his first day on the job at S.T.A.R. Labs when he met Hartley and Caitlin. Joe asks Eddie for a favor but asks him to keep it a secret from Barry.
Crazy For You Caitlin takes Barry out to a local karaoke bar to help them both find new loves. Caitlin strikes out but Barry meets a sports reporter and asks her out for a date. Meanwhile, Cisco considers Hartley's dangerous offer; and the team search for Shawna, a meta-human with teleportation powers who just busted her boyfriend out of Iron Heights.
The Nuclear Man Barry goes after Ronnie when he realizes Caitlin's fiance is a dangerous meta-human who attacked a physicist. To track him, Barry visits Dr. Martin Stein who is working on a project called F.I.R.E.S.T.O.R.M. Meanwhile, Barry struggles to balance his duties as the Flash with the relationship he has with Linda Park; and Joe enlists Cisco's help to reinvestigate the murder of Nora Allen.
Fallout A nuclear explosion separates Ronnie and Dr. Stein. When General Eiling targets Firestorm, the two must decide whether they are safer together or apart. Meanwhile, Mason Bridge tells Iris that something secret is going on at S.T.A.R. Labs; and Stein gives Barry some important information about time travel.
Out Of Time The Weather Wizard appears in Central City to avenge his brother's death and targets Joe, who shot the man. Meanwhile, Cisco recalls the night when the team captured the Reverse Flash and realizes something doesn't add up; and Barry and Linda go on an awkward double date with Eddie and Iris.
Rogue Time The Flash learns that Captain Cold and Heat Wave have returned to Central City, and that Snart has brought along his sister Lisa to help wreak havoc on the town.
Tricksters A copycat killer known as the Trickster sets off bombs in Central City. In an effort to stop him, Barry and Joe seek help from the original Trickster, a criminal mastermind who has been imprisoned for 20 years. Meanwhile, Iris asks Eddie to help with a case. In flashbacks, Harrison Wells is shown coming up with the idea for the particle accelerator.
All Star Team Up Felicity Smoak and Ray Palmer visit S.T.A.R. Labs when Ray needs help with his Atom suit. But they are called into action when a meta-human named Brie Larvin unleashes hundreds of robotic bees to attack and kill her coworkers. Also: A group dinner with Barry, Felicity, Ray, Iris and Eddie turns into a disaster.
Who Is Harrison Wells? Joe and Cisco head to Starling City to continue their investigation of Dr. Wells. While in town, Cisco meets the Black Canary, who asks him for a favor. Meanwhile, Barry races to catch a meta-human who can transform himself into any person he touches, including the Flash.
The Trap Barry, Caitlin, Cisco and Joe set a trap for Wells, but it puts Cisco in grave danger. Meanwhile, Eddie makes a decision regarding Iris, which unsettles Joe.
Grodd Lives Dr. Wells unleashes Grodd on the city to distract Barry and his team who are dealing with Reverse Flash's latest threat. Joe, Barry and Cisco pursue Grodd into the sewers, but the gorilla kidnaps Joe.
Rogue Air Arrow and Firestorm aid the Flash when Barry reaches out to Captain Cold to help defeat Wells but then proves he can't be trusted.
Fast Enough Wells presents Barry with a life-changing choice. Meanwhile, Dr. Martin Stein and Ronnie Raymond return to help the S.T.A.R. Labs team for the final fight.