Elizabeth Joanna Mitchell (née Robertson; born March 27, 1970), is an American actress who is known for her roles as Dr. Juliet Burke on ABC's TV series Lost and as FBI agent Erica Evans on V. She has starred such films as The Santa Clause 2, The Santa Clause 3: The Escape Clause and Gia. Mitchell currently co-stars in Eric Kripke's television series Revolution, airing on NBC.