Juliet Burke is a fictional character from the television series Lost. She is portrayed by actress Elizabeth Mitchell and first appears in the third season. Juliet is a fertility doctor with a complex background, having been recruited to the mysterious island by the Others, a group of inhabitants with their own agenda. Throughout the series, Juliet's character evolves as she navigates the challenges of life on the island. She forms significant relationships with other characters, including Jack Shephard and Sawyer. Her expertise in medicine plays a crucial role in various plotlines, particularly concerning the island's unique health issues.