Elizabeth Mitchell (born Elizabeth Joanna Robertson: March 27, 1970) is an American actress. She is known for her lead role as Juliet Burke on the ABC drama mystery series Lost (2006–2010). Mitchell also had lead roles on the television series V (2009–2010), Revolution (2012–14), and Dead of Summer (2016), as well as a recurring role as the Snow Queen on Once Upon a Time (2014) and as Annuska Volovodov on The Expanse. She has starred in such films as Gia (1998), Frequency (2000), The Santa Clause 2 (2002), The Santa Clause 3: The Escape Clause (2006), and The Purge: Election Year (2016).
Mitchell was born in Los Angeles, California. Her stepfather, Joseph Day Mitchell, and mother, Josephine Marian Mitchell (née Jenkins), are lawyers based in Dallas. Mitchell and her mother moved to Dallas, Texas in 1970, where her mother married Joseph Mitchell in 1975. Mitchell graduated from Booker T. Washington High School for the Performing and Visual Arts, a public magnet school. She is the eldest of three sisters, the others being Kristina Helen "Kristie" Mitchell (b. 1978) and Katherine Day "Kate" Mitchell (b. 1981).