| ShortSummary | - As the police investigate the murder of one of the city's crime families, Barry suspects that the killer may be a metahuman who can control poison gases. As Barry and Joe work to discover the killer's identity, Dr. Wells and his team work to retrofit the particle accelerator into a prison specifically for metahumans where S.T.A.R. Labs can begin to find a way of reversing their mutations. This brings up difficult feelings and memories for Dr. Snow, whose fiancé, Ronnie Raymond, was killed when the accelerator exploded. Following another murder, Barry locates the killer, Kyle Nimbus, but is unable to subdue him. Barry discovers that Kyle does not control gases, but literally transforms his body into them. The team learn that Joe, who was the lead detective in the original case, is Kyle's next target. Barry races to Iron Heights Prison in time to save Joe's life. Barry forces Kyle to overexert himself so that Barry can apprehend him without Kyle turning into mist. The team lock Kyle into a custom cell that is able to keep him from escaping. In a flashback to when the accelerator explodes, Dr. Wells is seen going into his hidden room and viewing a surveillance video of Barry getting struck by lightning in his lab.
- Dr. Wells returns to his secret room, where it is revealed that he has been documenting Barry's growing abilities, and using his computer to look at events in the future. Barry arrives at a crime scene where the victim was murdered via electrocution, and charred behind all recognition, suggesting a metahuman was involved. While investigating the victims identity, the team identifies a power drain in the city. When Barry arrives, he is attacked by Farooq Gibran, a man who has the ability to siphon electrical energy. The attack drains Barry of his speed, and when Wells checks his secret computer it reveals that there are no references to Barry or "The Flash" in the future. Wells believes that Barry's body just needs an electrical jumpstart, and Farooq arrives at the lab while the team is attempting to help Barry. The process does not appear to work, but Wells quickly realizes that Barry's problem is psychological. When Farooq catches up to the team and Dr. Wells' life is in danger, Barry overcomes his fear, connects to his speed on a cellular level and stops Farooq. Later, Dr. Wells takes a sample of Farooq's blood to determine how he was able to absorb Barry's abilities.
- A new metahuman, Roy Bivolo, shows up with the ability to send people into an uncontrollable rage, and uses his ability to rob the Central City bank. The police track him to a warehouse, where he uses his abilities on a cop to facilitate his escape. Barry arrives in time to save Joe, but is almost injured himself before Oliver, as the "Arrow", arrives to stop the cop. Later, Oliver informs Barry that they are tracking a Starling City killer who uses razor sharp boomerangs. Barry and Oliver agree to team-up and catch each other's targets. Oliver tries to teach Barry to be more mindful of his surroundings, but Barry decides to go after Bivolo by himself. Bivolo uses his abilities on Barry, but because of Barry's powers it makes the effects last longer. Oliver tries to stop Barry, and the two engage in a fight. Oliver manages to wrangle Barry long enough for Dr. Wells and Joe to use colored strobe light to reset Barry's emotional state. Afterward, Barry and Oliver capture Bivolo and place him in the prison at S.T.A.R. Labs.
- With help from Cisco, Barry begins using his abilities to stop minor crimes and help citizens across the city. As Barry begins to push himself more and more, he begins to develop debilitating side effects. While assisting Iris on a school assignment, Barry witnesses a robbery by a crew of men, but faints while trying to stop them. The S.T.A.R. Labs team determine that Barry is becoming hypoglycemic from the use of his abilities due to a sped-up metabolism and needs to ingest more calories to maintain his energy level. The team eventually learns that the robbers are actually one man, Danton Black, who has the ability to create clones of himself. Black wants to kill his former employer, Simon Stagg, who stole Black's cloning research. With encouragement from Joe, Barry goes after Black and successfully stops him from killing Stagg. However, Black commits suicide to prevent being captured. Afterward, Barry accepts Joe's help in finding out who really killed Barry's mother. Later, Wells visits Stagg, who has already become obsessed with the Flash after witnessing his powers and plans to exploit him as he did to Black. To protect Barry, Wells kills Stagg.
- Dr. Wells begins testing Barry's powers by forcing him to perform multiple tasks at superspeed. In the middle of the tests, a group of men attempt to hijack an armored truck carrying a priceless diamond. Barry races over and stops the crime, as well as identifies Leonard Snart from a set of police mugshots. Felicity Smoak arrives to check on Barry, after learning that he woke from his coma. Happy to see Felicity, Barry introduces her to his friends at S.T.A.R. Labs. To combat the "Streak", Snart acquires stolen tech from S.T.A.R. Labs, which includes a cryonic gun. Cisco reveals to Barry that he created the gun as a fail-safe against Barry should he become a killer like the other metahumans they encountered. Felicity helps the team locate Snart, who sets a trap for Barry. Cisco, Caitlin, and Felicity arrive in time to save Barry, and Snart is able to escape. Later, Snart tracks down his former partner, Mick, who has an affinity for fire, and offers him a place by Snart's side taking back Central City from the masked superhero.
- A new metahuman appears in Central City, with the ability to turn anything she touches into an explosive. Barry is able to discover that the metahuman, Bette Sans Souci , is a former military explosives expert who was changed by the particle accelerator when it bonded bomb shrapnel to her body on a cellular level. As General Wade Eiling hunts for Bette, Barry brings her to S.T.A.R. labs where the team explains to her how she got her powers. Unfortunately, they cannot reverse the process. While the team is away, Dr. Wells convinces Bette to kill Eiling so that he cannot exploit any metahumans. Barry races to stop her, but Bette sets off several bombs around Eiling and his men. Eiling manages to shoot Bette, which causes her body to turn into a massive bomb. Barry speeds off with Bette's body and drops it in the river to save the city from the explosion. General Eiling visits Dr. Wells demanding that they work together, as they did in the past, to collect the metahumans. Dr. Wells refuses and warns Eiling to never return to S.T.A.R. labs. In a flashback set five years in the past, Dr. Wells tells Eiling he is putting an end to their experiments. After Eiling leaves, Wells walks to a cage and tells Gorilla Grodd that he has plans for him.
- Iris is visited by the Streak, who again pleads with her to stop writing about him. Before he can finish, Barry speeds off to stop a car thief. Barry confronts the thief, but when he hits him the thief's skin turns to steel and Barry breaks his hand. Barry runs back to the lab before he can be hurt further. The thief is identified as Tony Woodward, who was Barry's childhood bully. Barry and the team discover Tony's hideout, and Barry rushes in without a plan to defeat him. Tony gets the upper hand again and Barry is beaten up and left for dead. Back at the lab, Cisco determines that if Barry can hit Tony at over 800 mph at the right angle, then he can create enough force to compromise Tony's metal structure. Tony kidnaps Iris and demands that she write about him. Barry arrives and successfully hits the speed necessary to temporarily disable Tony's abilities. Afterward, Tony is locked away at S.T.A.R. labs, and Iris renames her hero "The Flash". Meanwhile, Joe is visited by the metahuman that killed Barry's mother, who steals the case file and threatens Joe to drop his investigation.
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