By Natalie Abrams
Updated February 09, 2016 at 08:05 PM EST
Credit: Katie Yu/The CW

Andy Mientus will reprise his role as the Pied Piper in an upcoming episode of The Flash, EW has learned.

The Smash star made his debut in season 1 as Hartley Rathaway, the arrogant former protégé of Harrison Wells (Tom Cavanagh) at S.T.A.R. Labs. Hartley became a metahuman called Pied Piper after losing his hearing when the particle accelerator exploded.

He’ll return in the 17th episode, fittingly titled “Flash Back,” to wreak havoc once again on his former colleagues when The Flash impossibly revisits an earlier timeline.

The Flash airs Tuesdays at 8 p.m. ET on The CW. Get scoop on the show’s trip to Earth-2 here.

Episode Recaps

We Are The Flash

The Flash

After the success of Arrow, Barry Allen (a.k.a. The Flash) gets his own CW treatment in this comic-themed spin-off.

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