Sneak Peek the final segment of the "Arrow" episode, "Three Ghosts", showing the origins of the 'Scarlet Speedster', aka 'Barry Allen', the 'Flash':
"...'Barry Allen' grew up reading the adventures of his favorite superhero, 'Jay Garrick', the original 'Flash'.
"When he was a child, his mother was killed and his father was convicted of the crime. The drive to prove his father was innocent gave Barry a strong belief in justice. Barry loved chemistry from an early age, winning a scholarship to University, graduating with a major in organic chemistry and a minor in criminology.
"While a senior, Barry helped the authorities apprehend a bank robber, and he was offered a job as a police scientist.
"During an electrical storm, Barry returned to his lab. All of a sudden, a bolt of lightning streaked through a window, shattered a chemical cabinet and covered Barry in electrified chemicals.
"The freak accident somehow giving Barry superhuman speed..."
"Part of the fun for the audience is to see how we view our 'Arrow' take on the 'Flash' legacy," said "Arrow" producer Andrew Kreisberg. "Some of it will feel very familiar to DC Comics, some of it hopefully will feel different, fresh and exciting. The same way we approached 'Arrow' is the same way we're approaching 'Barry'. There will be extraordinary events in the world and the characters will react in the same way..."
Created by writer Gardner Fox and illustrator Harry Lampert, the original Flash first appeared in "Flash Comics" #1 (January 1940).
The character possesses the ability to run and move extremely fast, use superhuman reflexes and seemingly violate certain laws of physics.
To date, four different characters—each of whom gained the power of 'super-speed' have assumed the identity of the Flash, including 'Jay Garrick' (1940–present), 'Barry Allen' (1956–1985, 2008–present), 'Wally West' (1986–2006, 2007–2012), and 'Bart Allen' (2006–2007, 2009–present). Before Wally and Bart's ascension to the mantle of the Flash, they were both Flash protégés under the same name 'Kid Flash'.
Click the images to enlarge and Sneak Peek the origin of the 'Flash' on the "Three Ghosts" episode of "Arrow":