Because he is a speedster, his power consists mainly of superhuman speed. Various other effects are also attributed to his ability to control the speed of molecular vibrations, including his ability to vibrate at speed to pass through objects. The Flash wears a distinct red and gold costume treated to resist friction and wind resistance, traditionally storing the costume compressed inside a ring.
Barry Allen's classic stories introduced the concept of the Multiverse to DC Comics, and this concept played a large part in DC's various continuity reboots over the years. The Flash has traditionally always had a significant role in DC's major company-wide reboot stories, and in the crossover Crisis on Infinite Earths #8 (Nov. 1985), Barry Allen died saving the Multiverse, removing the character from the regular DC lineup for 23 years. His return to regular comics is foreshadowed during the narrative (and a single image of a blur) in Grant Morrison's crossover story Final Crisis: Rogues' Revenge #3 (Nov. 2008), fully actualized in Geoff Johns' accompanying The Flash: Rebirth #1 (June 2009), kicking off a six-issue limited series. He has since played a pivotal role in the crossover stories Blackest Night (2009), Flashpoint (2011), Convergence (2015), and DC Rebirth (2016).
Allen is the most well-known and commonly featured individual to take the mantle of the Flash, being present in numerous media adaptations, one-shots and comic-book story-arcs taking place in alternate universes.
Barry Allen has been featured in several media, first appearing in animated form in the 1967 The Superman/Aquaman Hour of Adventure and then in the related Super Friends program. Since then he has appeared in several DC Universe Animated Original Movies. Actor John Wesley Shipp portrayed the character in the live-action 1990s television show The Flash and the Arrowverse. Allen is currently portrayed by Grant Gustin in the Arrowverse shows in a main capacity, especially the 2014 television series The Flash, while Ezra Miller portrays the character in Crisis on Infinite Earths and the DC Extended Universe films Batman v Superman: Dawn of Justice, Justice League, and will return in the 2022 film The Flash.