From Wikipedia, the free encyclopedia. Pamela Susan Shoop (born June 7, 1948) is an American character actress in film and on television. She often appeared in shows created by Glen A. Larson. Shoop's best known film role was in the 1981 horror film Halloween II, as Karen, a nurse. She appeared in the pilot episode of Knight Rider ("Knight of the Phoenix") and later on in the season four premiere ("Knight of the Juggernaut"). She also appeared in the pilot episode of Magnum, P.I. Other guest a ...