Pied Piper, played by Andy Mientus, 28, will make his debut in the show as The Flash's latest nemesis this week, reported the Daily Star.
"People don't expect a superhero show to go there. I think its really great to see a powerful, out gay character giving The Flash a run for his money," Mientus said.
The Pied Piper was caught up in the same explosion as The Flash but it turned him into a bitter baddie who can now manipulate sound waves.