- For the vigilante/superhero known as The Flash, see Barry Allen.
"You're so better off not knowing."
—Oliver Queen and Tommy Merlyn[src]
This article contains plot details about an upcoming episode.
Originally, the twentieth episode of Arrow's second season was going to act as a backdoor pilot, and should it be popular enough the series would be greenlit. However, after executives from The CW Network saw "The Scientist" and "Three Ghosts", Barry's premiere episodes on Arrow, they made the call to order the series straight to pilot. On May 8, 2014, The Flash was picked up to series. The show is set to air on The CW on Tuesday nights at 8pm. The series will premiere on October 7, 2014, the same week that Arrow's third season begins.
Barry Allen was just 11 years old when his mother was killed in a bizarre and terrifying incident and his father was falsely convicted of the murder. With his life changed forever by the tragedy, Barry was taken in and raised by Detective Joe West, the father of Barry’s best friend, Iris. Now, Barry has become a brilliant, driven and endearingly geeky CSI investigator, whose determination to uncover the truth about his mother’s strange death leads him to follow up on every unexplained urban legend and scientific advancement that comes along. Barry’s latest obsession is a cutting edge particle accelerator, created by visionary physicist Harrison Wells and his S.T.A.R. Labs team, who claim that this invention will bring about unimaginable advancements in power and medicine. However, something goes horribly wrong during the public unveiling, and when the devastating explosion causes a freak storm, many lives are lost and Barry is struck by lightning. After nine months in a coma, Barry awakens to find his life has changed once again - the accident has given him the power of super speed, granting him the ability to move through Central City like an unseen guardian angel. Though initially excited by his newfound powers, Barry is shocked to discover he is not the only “meta-human” who was created in the wake of the accelerator explosion - and not everyone is using their new powers for good. In the months since the accident, the city has seen a sharp increase in missing people, unexplained deaths and other strange phenomena. Barry now has a renewed purpose - using his gift of speed to protect the innocent, while never giving up on his quest to solve his mother’s murder and clear his father’s name. For now, only a few close friends and associates know that Barry is literally the fastest man alive, but it won’t be long before the world learns what Barry Allen has become. The Flash.
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West
- Jesse L. Martin as Detective Joe West
- Carlos Valdes as Cisco Ramon 
- Rick Cosnett as Detective Eddie Thawne
- Danielle Panabaker as Caitlin Snow
- Tom Cavanagh as Harrison Wells
- TBA as Hartley Rathaway
- TBA as Danton Black/Multiplex
- John Wesley Shipp as Henry Allen
- Michelle Harrison as Nora Allen
- Patrick Sabongui as Captain David Singh
- Al Sapienza as Detective Fred Chyre
- Chad Rook as Clyde Mardon/Weather Wizard
- Stephen Amell as Oliver Queen/The Arrow
- Robbie Amell as Ronnie Raymond/Firestorm
- William Sadler as Simon Stagg
- Wentworth Miller as Leonard Snart/Captain Cold
- Emily Bett Rickards as Felicity Smoak
- Kelly Frye as Bette Sans Souci/Plastique
- Robert Knepper as William Tockman/The Clock King
- Clancy Brown as Wade Eiling/The General
- Greg Finley as Tony Woodward/Girder
- Dominic Purcell as Mick Rory/Heat Wave
Based upon characters published by DC Comics. Through a freak accident, scientist Barry Allen (Grant Gustin) is given the power of super speed, which transforms him into the Fastest Man Alive.