Christine Chapel is a fictional character in the Star Trek universe, played by Majel Barrett. She appears in many episodes of the original series and in some of the movies.
Christine Chapel gave up her career in bioresearch to find her lost fiancée Dr Roger Korby. Korby dies shortly after Chapel finds him. Chapel stays on the Enterprise and works as a nurse under Dr Leonard McCoy. She is romantically interested in the first officer, Mr. Spock, but he doesn't return her feelings. Following the Enterprise's five year mission she earns her medical degree in 2270 and returns to the Enterprise.
