Dr. Henry Hewitt, nicknamed Tokamak by Cisco Ramon, is a meta-human who was affected by the S.T.A.R. Labs particle accelerator explosion.


Early life

Henry graduated Summa Cum Laude from Hudson University, holding a double major in Applied Physics and Biological Engineering. He also had a criminal record for one account of battery and two accounts of aggravated assault which led to a court order of anger management therapy.[1]

Firestorm Candidacy and Revenge

Henry was called to S.T.A.R. Labs by Caitlin Snow because his molecular structure made him one of two perfect matches for the unstable Martin Stein. While the pair seemed like a perfect match due to their backgrounds as scientists, they failed to converge twice. Henry was irked and disappointed, berating Caitlin for getting his hopes up over nothing. Back at his science lab, his superior grilled him over his tardiness and work ethic, causing Henry to erupt into a tirade and his body covered in the same red aura as his hand when he departed S.T.A.R. Labs. Henry attacked Caitlin while she was talking to Jefferson Jackson (the other candidate for Martin) in an attempt to kill her for what she did to him. Henry later absorbed the energy from the lights of the football stadium at Jackson's alma mater as The Flash and Firestorm teamed together to defeat him, while initially finding it tough as Henry became stronger the more enraged he became. The Flash and Firestorm managed to overload his power by taunting him and increasing his anger, stopping him. Henry was kept in the S.T.A.R. Labs Pipeline until he agreed to calmed down and keep quiet about everything he'd seen and been through.[1]


At first, Henry came off as a well-meaning young man, apart from being particularly confident about his "destiny" to aspire to greater things, but as soon as things didn't follow his expectations he quickly shows his true colors; hot-headed and temperamental. Henry's anger causes him to lash out at people, threatening and later assaulting people who have annoyed and disappointed him, his anger being derived from his bloated ego. As Cisco pointed it out, Henry had an immense ego, something the latter would demonstrate by berating and threatening his own boss for scrutinizing him, or towards Caitlin Snow for getting his hopes up of becoming the new half of the Firestorm entity. True to his ego, Henry felt entitled and openly slandered Jefferson Jackson for replacing him, believing and saying out loud that he deserved the Firestorm Matrix.

Powers and abilities


  • Energy Absorption: Henry can absorb electromagnetic energy and is shown absorbing energy from the lights of a football stadium before his fight with The Flash and Firestorm.
  • Energy Generation: Henry can generate the energy he absorbs and release it as powerful blasts from his hands.


The Flash

Season 2

Behind the scenes

  • In physics, a tokamak is a device used to regulate and contain plasma in the shape of a torus (a circular pattern) with the use of a magnetic field.
  • In the DC comics, Tokamak is the supervillain identity of Henry Hewitt, a man who tries recreating the accident which created Firestorm, in the process gaining the power to trap objects into an energy ring, hence the name "Tokamak".


  1. 1.0 1.1 "The Fury of Firestorm"
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