AceShowbiz -

Giancarlo Esposito is returning to "Once Upon a Time" this fall. The actor is going to reprise his role as Magic Mirror a.k.a. Sidney Glass in the fourth season of the fairy-tale series on ABC.

Most recently, Esposito took part on NBC's "Revolution". He played Major Tom Neville on the series. His other credits include "Breaking Bad" where he played Gustavo "Gus" Fring and a guest role on NBC's "Community".

Previously, "Once Upon a Time" has added characters from "Frozen (2013)" for the upcoming season. Elizabeth Lail and "Greek" alum Scott Michael Foster have joined the series as Anna and Kristoff respectively, while Elsa the Snow Queen will be played by Georgina Haig.

Anna, voiced by Kristen Bell in the movie, is described as a "a fun-loving, fearless optimist who often gets herself into situations where she is in over her head, yet is able to triumph due to her resourcefulness and can-do spirit." Kristoff, voiced by Jonathan Groff, is a handsome loner who is interested in Anna. Elsa reportedly will appear in nine episodes, while the other two will have less screen appearance.