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Mirror, mirror on the wall, guess who's returning to Once Upon a Time this fall.

Giancarlo Esposito is set to reprise his role as Sidney Glass, otherwise known as the Magic Mirror, in the Season 4 premiere, has learned.

Details on the return of the intrepid Storybrooke reporter are being kept under wraps, though the last time viewers saw anything of Sidney Glass, it was on the nameplate of a locked door in the deep recesses of Storybrooke hospital. 

The Season 4 premiere, which is fittingly titled "A Tale of Two Sisters," will also introduce Frozen characters Anna (Elizabeth Lail), Elsa (Georgina Haig) and Kristoff (Scott Michael Foster). Esposito's former Revolution co-star Elizabeth Mitchell recently joined the cast as a potential villain with ties to Anna and Elsa.

Esposito is best known for his Emmy-nominated turn on Breaking Bad.

Once Upon a Time returns Sundays this fall on ABC. Are you excited for Sidney Glass's return?

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