TV Line reports that Andy Mientus will play Hartley Rathaway, aka the Pied Piper, and an openly gay character.
The character is described as: Hartley is a bona fide genius who used to work at S.T.A.R. Labs until a falling out with his mentor, Harrison Wells (Tom Cavanagh). The particle accelerator robbed Hartley of his hearing, but inspired him to create a series of sonic weapons that he uses in an effort to punish Wells by destroying his new protege: The Flash.
Look for Andy Mientus to debut in the 11th and 12th episodes.
Mientus is known for Chasing Life and the Smash TV series.
The Flash airs Tuesdays at 8pm ET on the CW.