Lucy Lynskey is a fictional character from the popular television series The Big Bang Theory. She is portrayed by actress Kate Micucci and first appears in the show's ninth season. Lucy is known for her quirky personality and her struggles with social anxiety, which makes her interactions with the main characters both humorous and relatable. In the series, Lucy develops a romantic relationship with Rajesh Koothrappali, one of the main characters. Their relationship explores themes of love, friendship, and the challenges of communication. Lucy's character adds depth to the show's exploration of relationships and personal growth.