Elizabeth Mitchell (born Elizabeth Joanna Robertson; March 27, 1970) is an American actress. She is best known for her lead role as Juliet Burke on the ABC mystery drama series Lost (2006–2010), for which she received a Primetime Emmy Award nomination. Mitchell also had lead roles on the television series V (2009–2010), Revolution (2012–2014), Dead of Summer (2016), and The Santa Clauses (2022–present). She had recurring roles on the television series ER (2000–2001), Once Upon a Time (2014), The Expanse (2018, 2021), and Outer Banks (2021–present). Mitchell has appeared in numerous films, including Gia (1998), Frequency (2000), Nurse Betty (2000), The Santa Clause 2 (2002), The Santa Clause 3: The Escape Clause (2006), Running Scared (2006), Answers to Nothing (2011), The Purge: Election Year (2016), and Queen Bees (2021).