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Bartholomew "Bart" Allen is a superhero in the fictional. Allen first appeared as the superhero Impulse. He later became the second Kid Flash and the fourth Flash within the comics universe. Allen's first cameo appearance was in The Flash vol. 2, #91, while his first full appearance was in issue #92. He starred in Impulse (1995-2002) and The Flash: The Fastest Man Alive (2006-2007). Allen was a member of the superhero teams Young Justice and Teen Titans.

Born in the 30th century to Meloni Thawne and Don Allen, Bart is related to a number of superheroes and supervillains. His father, Don, is one of the Tornado Twins and his paternal grandfather is Barry Allen, the second Flash. His paternal grandmother, Iris West Allen, is also the adoptive aunt of the third Flash, Wally West (therefore, Bart's cousin). Bart is also the cousin of XS, a Legionnaire and daughter of Dawn Allen. On his mother's side, he is a descendant of supervillains Professor Zoom and Cobalt Blue as well as the half brother of Owen Mercer, the new Captain Boomerang. In addition to these relatives, he has a supervillain clone known as Inertia.

Impulse
left|thumb|150px|Impulse in the [[Young Justice series. Art by Todd Nauck.]] Suffering from a hyper-accelerated metabolism, Bart Allen was aging at a faster rate than that of any human being thus causing him to appear the age of twelve when he was chronologically only two years old. To prevent him from developing mental health problems, he was raised in a virtual reality machine which created a simulated world that kept pace with his own scale of time. When it became clear that this method was not helping, his grandmother, Iris Allen, took him back in time to the present where The Flash,Wally West, tracked him down in a race across the world. By forcing Bart into an extreme burst of speed, Wally managed to shock his hyper-metabolism back to normal. Because he had spent the majority of his childhood in a simulated world, Bart had no concept of danger and was prone to leaping before he looked. The youth proved to be more trouble than Wally could handle, and he was palmed off onto retired superhero speedster Max Mercury, who moved Bart toManchester, Alabama. As retconned in Impulse #50, Batman named him "Impulse" as a warning, not as a compliment.

Bart joined the Titans early in his career before going on to become one of the founding members (along with Robin and Superboy) of the superhero team Young Justice. For a time, Impulse became the owner of a spaceship granted to him by a rich sultan in appreciation for having helped save his castle. The team used this ship to reunite Doiby Dickles with his queen and restore the rightful rule of Myrg. Impulse stayed with Young Justice for an extensive period of time during which he developed the ability to make speed-force energy duplicates. This allowed him to be in multiple places at once. The newly acquired power proved useful until one of the duplicates was killed during the "Our Worlds at War" storyline when half the team was lost on Apokolips. Bart quit Young Justice temporarily as the death of his duplicate led him to come to terms with his own mortality.

Following Max Mercury's disappearance, Bart was taken in by Jay Garrick, the first Flash, and his wife Joan. After the breakup of Young Justice, Bart joined some of his former teammates in a new line-up of the Teen Titans.

Kid Flash
thumb|left|Bart becomes Kid Flash. Art by [[Mike McKone.]]

Shortly after Bart joined the Teen Titans, he was shot in the knee by Deathstroke (who at the time was possessed by Jericho) and received a prosthetic one. While recovering, Bart read every single book in the San Francisco Public Library and reinvented himself as the new Kid Flash. Once healed, the artificial knee did not affect his ability to run at speeds approaching that of light. When Robin reminded him that by becoming Kid Flash, he would be forced to live in the Flash's shadow, Bart said firmly, "No, he'll be living in mine."

In the "Titans Tomorrow" storyline, Bart assumed the mantle of the Flash after the current Flash died in a "Crisis". In this alternate future he was able to steal the speed of others, a power he used on his past self. This reality shows a grown Bart posing as a member of the so-called Titans of Tomorrow. However he is really a spy working on the behalf of Titans East, a resistance group led by the future Cyborg. Additionally, the future Bart is romantically involved with Rose Wilson, The Ravager.

Infinite Crisis
225px|Bart Allen attacks Superboy-Prime wearing [[Flash (Barry Allen)|Barry Allen's suit, art fromInfinite Crisis #7 by Phil Jimenez.|thumb]]

During the Infinite Crisis Superboy-Prime attacked Conner Kent (Superboy) and injured or killed several Teen Titans, thus prompting Bart to stop his rampage. He accomplishes this by running him at top speed into the Speed Force with the help of veteran speedsters Wally West and Jay Garrick. The feat took its toll on Garrick, who reached his limit before entering the Speed Force, and West, who turned into energy and vanished, leaving Bart alone in the fight against an armored Superboy-Prime. Luckily for the young speedster, Barry Allen, Johnny Quick and Max Mercury, all of whom had been previously absorbed into the Speed Force, appeared and aided him.

Bart spent four years in an alternate reality's Keystone City, where along with Wally, an alternate version of Jay Garrick and the ghosts of Max and Barry, Superboy-Prime managed to escape from his prison. The speedsters rallied together to return to their dimension. In an attempt to get there before Superboy-Prime, Bart absorbed the Speed Force using Wally's ring and Barry's costume to help him survive his journey.

Wearing his grandfather's costume, an aged Bart reappeared in Tokyo just in time to fight alongside Superman and many other heroes in the Battle of Metropolis unleashing his anger against Superboy-Prime for killing Conner Kent and so forcing the villain to retreat from battle. When the crisis was over, Bart explained to Jay where he had been and how the Speed Force was destroyed. Having used up the residual speed locked in his body in the fight for Metropolis, Bart gives Barry's costume to Jay proclaiming him "the fastest man alive."

The Flash: The Fastest Man Alive (2006-2007)
thumb|Bart Allen as the Flash. Variant cover of The Flash: The Fastest Man Alive #1 (2006). Art by Andy & Joe Kubert. In Teen Titans (vol. 3) #34, a One Year Later issue, Robin refers to Bart as "kind of retired". He suffers from partial amnesia about the time he spent on the alternate Earth during the Crisis. Bart and his roommate, Griffin Grey, assemble cars on a scab basis for a newly automated, high-tech plant in Keystone City. Bart has nightmares about the Speed Force, such as when he and Jay Garrick are separated during Infinite Crisis, and glimpses of Barry's death in Crisis on Infinite Earths. Lying to everyone that the Speed Force is gone, Bart is still able to tap into it, though the effects are far more difficult to control and potentially lethal. Despite the risk, Bart attempts, unsuccessfully, to use his powers to save Griffin when a bomb is set off at the plant, and is seen doing so by Jay.

Bart tells the Garricks about the existence of the Speed Force and his desire to divest himself of his powers, even asking S.T.A.R. Labs to remove his link with the Speed Force. S.T.A.R. recreates the material used to make Barry's Flash uniform but in the modern design worn by Wally. Bart is initially unwilling to wear this, but eventually uses the uniform. When S.T.A.R.'s Keystone location is blown up, Bart dons the uniform to rescue Valerie Perez. Because of Bart's feelings for the young scientist, he allows Valerie to examine him. She continues to work alongside him due to her gratitude over him rescuing her from a riot at her high school. Their relationship continues after Valerie is fired from S.T.A.R. Labs, and she is discovered to be the daughter of Manfred Mota. In the end, Bart and Valerie's relationship proves short lived, as Valerie struggles to come to terms with Bart's life as a superhero.

Meanwhile, Griffin, who gains superspeed after the bomb explodes at the plant, becomes more unbalanced and ages unnaturally. Griffin nearly kills Bart and kidnaps Jay Garrick, but Bart rescues him. Griffin destroys Keystone's bridge in order to stage a rescue himself, but Bart, who makes a public return as the Flash, foils Griffin's plans. When he is hit by an energy blast during the fight, Bart finally remembers his time on the alternate Earth during the Crisis and why the Speed Force is inside him, but he is unable to save his friend, who dies learning that the "new" Flash and Bart are the very same person.

However, when Inertia resurfaces and kidnaps Valerie on behalf of Mota and then leaves behind a fake Dear John Letter, the increasing pressure leads Bart to leave Keystone City for Los Angeles. Inertia later lets Valerie escape in order to take her hostage in Las Vegas, where Valerie is chained near a photon cannon set to target the Speed Force. Reunited with Valerie, Bart exerts more control over the Speed Force, outracing the photon ray and freeing his girlfriend. They reunite, and Bart shares his future plans with Jay: with Valerie's blessing he will stay in Los Angeles and follow in Barry's footsteps by studyingforensics at the local police academy.

Soon after donning the Flash identity, Bart is considered for Justice League membership and gets particular support from Batman, who feels he is more than ready for the position.

Robin contacts Bart and asks him to return to the Teen Titans. However, after fighting Steppenwolf with the newly reformed Justice League, Bart tries to join the League rather than rejoin the Titans.

When Bart confronts Captain Cold at his apartment, Zoom appears and attacks Bart. Zoom apparently was enlisted by Bart's grandmother, Iris. It's later revealed that Iris only came to the past to warn her grandson about the Rogues (consisting of Abra Kadabra, Mirror Master, Heat Wave, the Pied Piper,the Trickster, Weather Wizard, and Captain Cold), led by Inertia, teaming up. Together they are trying to build a machine that will stop time. As their plan begins to come to fruition, Bart is arrested for the fight with Steppenwolf, who was a New God.

Death
thumb|Bart dies. Art by Tony Daniel. Bart reveals himself as the Flash in order to fight the Rogues. During the battle, it is revealed that the machine built by Inertia actually drains the Speed Force from an individual instead of freezing time. Using it on the Flash, Bart's powers are stripped away from him, leaving him surrounded by the Rogues and leading to the appearance of the Black Flash. Inertia's machine proves unstable, however, and will destroy the west coast if the Speed Force is not safely released from it. In order to buy Valerie time to release the Speed Force, Bart fights the Rogues before chasing after Inertia. After catching and beating Inertia, Bart again fights the Rogues. Panicked, Captain Cold, Heatwave, and Weather Wizard strike him down fatally. His sacrifice saves thousands of lives.

Mourners hold a candlelight vigil at the Flash Museum. Outside of Titans Tower in San Francisco, a memorial statue of Bart in his Kid Flash uniform was placed next to the statue ofSuperboy.

As Wally West's return to New Earth coincided exactly with Bart's death, later Inertia alleged that Bart's loss of powers was a direct consequence of Wally absorbing the newly released Speed Force. However, no further blame was put on Wally, who avenged his protégé by freezing Inertia's body in time but leaving his mind active. Inertia is forever on display in a new area of the Flash Museum, dedicated to Bart's life, and will now spend forever looking at statues honouring Bart's heroic legacy as Impulse and Kid Flash. In Final Crisis: Rouges revenge Inertia is unfrozen and continues his rampage trying to kill bart allen's family but is stopped by the flash's enemy zoom, zoom reveals that he wants him to become the new kid flash, confused inertia asks why and zooms informs that it is libra that wants him to become kid flash not him, zoom teaches him about being a speedster but is interrupted by pied piper and appears the Rouges, zoom attacks the Rouges stating that the Rouges only occupy the Flash, pied piper once again stops everyone with his tuning fork. Pied piper is stabbed by Libra saying "they say you're able to conduct the powers of the equation through your instruments, that you are a muse to the new gods. i say blasphemy. You're nothing more than a musical bard with nowhere to play" Libra is holding weather wizards son stating that everyone here has a place in the secret societey and libra threatons to kill weather wizards son, weather wizard states he has killed the only person that trually cared about him (His Brother) inertia interrupts and snapps his fingers making an explosion and weather wizards son disappears. Inertia claims he is now the new kid zoom but declines libras invitation to join him as libra claims speedsters are the key to it all, kid zoom steals zooms time away from him leaving him as a "cripple" the rouges and kid zoom battle it out. kid zoom is comprehended by the pied piper and the rouges kill kid zoom, libra reveals to the rouges he is "The Reverend Of Evil Incarnate" then tells the rouges the central city's flash is back(Bary Allen). The rouges deliver Inertia's corpse to keystone city with a message reading "Tell the flash were even - The Rouges" The Rougues hide out in the basement of the flash museum because they believe that no-one will look for them there, captain cold says "once the skies are black to blue, the game is back on"

Marc Guggenheim, writer of the story arc in which Bart dies, has stated that this was an editorial decision, and that he was instructed that his five-issue run would have to end with Bart's death and the involvement of the Rogues.

Funeral
Keystone City holds a funeral for Bart, in which Jay Garrick, Cyborg, Wonder Girl and Robin give eulogies. At the end of his own speech, Robin plays a video Bart made soon after he had taken on the mantle of Kid Flash. In it Bart relays to his friends that no matter what happens to him, he will always be proud of having been a part of the Flash legacy and how happy he was being a member of the Teen Titans. Shortly after the Keystone funeral, a more private funeral is held for Bart at Titans Tower, where they have erected a golden statue of Bart as Kid Flash beside the statue of Superboy.

During the Sinestro Corps invasion of Earth, Superboy-Prime's first act was to visit and defile Bart's grave which was inscribed "Bart Allen: The Flash". Superboy-Prime used his heat vision to cross out "The Flash" and write in its place "stupidest boy dead."

Powers and abilities
Bart's primary power is speed, along with abilities that are common to comics speedsters, such as creating whirlwinds, running on water and vibrating through matter. That last ability will result in 'molecular taffy' if Bart does not concentrate; he also possesses an aura that prevents air friction while running. Before being shot in the knee, he was faster than the current Flash had been at his age. Bart does possess some abilities that other speedsters do not have. He has the ability to produce "scouts," Speed Force avatars that he can send through the timestream, but has used it infrequently since the death of one avatar put him in a coma during the "Our Worlds at War" storyline that crossed over among the Impulse, Superboy, and Young Justice titles. After being forced to use it during the "World Without Young Justice" crossover event, he was able and willing to use them with ease, up until he became Kid Flash. thumb|right|Bart surrounded by the Speed Force on the regular cover of The Flash: The Fastest Man Alive #1. Art by Ken Lashley.

Bart is resistant to the alterations in the time stream. His parents met only in post-Zero Hour continuity, but he arrived before the event. Bart has the ability to recall everything he had ever read, heard or watched (which includes speed-reading every book in the San Francisco Public Library), allowing him to spout encyclopedic information concerning the situation at hand as well as quotations from Mark Twain, of whose work he is fond.

After Infinite Crisis, Bart's connection to the Speed Force is more difficult to control because he now contains the Speed Force and, in essence, is the Speed Force. When he taps into the Speed Force, Bart appears to have electricity crackling around him, and the Speed Force inside him has become so lethal, that he initially wore the Flash suit while running in order to prevent it from killing him. After remembering his experiences on an alternate Earth during a fight with Griffin, he began to gain a measure of control over the Speed Force before it was released from his body just prior to his death.

Flash legacy
Since his first appearance in The Flash vol. 2 #91, Bart had been trained by several speed-endowed heroes such as Jay Garrick, Johnny Quick and Max Mercury. Prior to his reluctance to don the red and yellow, Bart showed a lot of enthusiasm towards his role as the future Flash. However, Wally West had a number of apprehensions about Bart, as shown by Wally's naming Jesse Quick as his successor and his refusal to deliver to Bart his invitation from Cyborg to join the latest incarnation of the Teen Titans. Bart took these acts in stride though, and, after Robin claimed that he will always live in the Flash's shadow, Bart even says that "the Flash will be in mine."

Other versions
Numerous versions of Bart have appeared throughout comics.

Dark Tomorrow
thumb|Bart as an adult Impulse. Art by [[Humberto Ramos.]] Following the death of Max Mercury and Helen Claiborne, Bart went back to the future to be with his mother, while his girlfriendCarol Bucklen came along. Carol began studying the Speed Force to use it for the benefit of humanity. The corrupt President Thawne, Bart's grandfather, took their research and made the Hyperguard, a group of hyper fast soldiers. The adult Carol managed to pull her younger self and Bart into the future. Bart ended up preventing Max's and Helen's death, thus preventing this reality from happening. This reality appeared in Impulse #s 73-75.

Titans Tomorrow
thumb|left|Bart as the new Flash during the [[Titans Tomorrow storyline. Art by Mike McKone.]] Bart was a crucial part of the Titans Tomorrow storyline. Here, Wally West is dead and Bart is the new Flash. The Teen Titans are now fascist like superheroes controlling the world. However, Bart is really a spy for Titans East, a rebel group lead by Cyborg and Bumblebee. He seems to have a romantic relationship with Rose Wilson.

The Titans Tomorrow group has recently returned, where it was revealed that due to Bart's recent death, the future time-line has been altered so these versions of him and Conner are actually clones of the originals, created by the alternate future version of Tim Drake. However, unlike his previous future self, the cloned Bart is completely on the side of his fascist team-mates.

Time and Tempest
Another alternate future showcased in The Ray #25-26. Here, Bart, Ray Terrill, and Triumph are "three rich guys with superpowers". Bart was in love with Ray's girlfriend, who Ray treated like dirt. However, Bart realized that he didn't have a chance with her either and ends up knocking Ray out and leaving him, not knowing that hitmen were on their way.

Tangent Comics
On Earth-9, Impulse is a type of soda, which is advertised with the slogan: For that get up and Go.

Legion of Super-Heroes
In a comic of the Legion of Super Heroes cartoon series, Bart Allen makes a guest appearance as Impulse. When Bouncing Boy and Duo Damsel get trapped in a Virtual Reality game, they meet up with Impulse, who aids them in saving the Virtual World that Bart is forced to live in (due to his hyper-accelerated growth) from being destroyed.

Trade paperback collections
Collected editions featuring Bart Allen from The Flash (vol.2), Impulse, and The Flash: The Fastest Man Alive:

Appearances in other media
In the original Kids WB! pitch for the Justice League animated series, Robin, Impulse, anda teenage female version of Cyborg were to be seen as junior members of the League. It was later decided to avoid their introduction, so as to avoid making Justice League seem like the old Super Friends series. The corresponding short animation is available as a bonus on the season one DVD of Justice League. 

Smallville
150px|Kyle Gallner as Bart Allen in [[Smallville (TV series)|Smallville's episode Run.|thumb]] An episode of Smallville entitled "Run" featured a speedster named Bart Allen played by Kyle Gallner. Bart also carries around identification with the names "Jay Garrick", "Barry Allen", and "Wally West", the first three Flashes in the main DC Universe. He was portrayed as a self-centered teenager who used his powers as a thief for personal gain, although he showed signs of changing his ways by the end of the episode when he helped Clark save his father. As a sort of in-joke, he hits on Chloe Sullivan and tells her that he is from 100 years in the future (He jokingly claimed that they were still in love by that point). At the end of the episode, after Bart says that he will travel the world to find others like him and Clark, maybe starting "a club or a league or something", Clark and Bart have a race; Bart is shown to be much faster than Clark, easily out-pacing him even when running backwards.

Gallner reprised his role in the season six episode "Justice", using the codename Impulse and wearing a costume of sorts for the first time on air. He appears as part of a team led by Green Arrow. According to Green Arrow, he found Bart one night in Star City during one of his patrols and saw that he was about to help himself to a "free meal", but, seeing goodness in Bart, he helped give him "direction". Along with Aquaman and Cyborg, they form a team to stop Lex Luthorand his LuthorCorp 33.1 project, the group rescuing Bart from a lab after he is captured. During missions, he is called "Impulse," a name he did not choose himself, much like in the comics. He is more composed as a fusion of various Flash traits, and personalities.