“We’re going to see Barry Allen first in two episodes, and then he’ll come back later as The Flash,” Gustin told E! Online.
“I’m a little fanboy – I’m so excited to be a part of the show.
“I got an audition, and I was really excited and a little skeptical at first, because I’m a comic book fan,” he said. “I know the character and know I’m a little young.”
The actor added that despite the more grounded reinvention of DC Comics characters Arrow, Allen will be appearing “in a pretty traditional Flash costume.”