Doctor Doctor is an American television sitcom that aired on CBS. It began a short run in June 1989, and was picked up for a full season the following fall. A second season followed in 1989–1990, but the show was cancelled at the end of the 1990–1991 television season, due to low ratings. One episode, "Long Day's Journey Into Deirdre", remains unaired in the United States (although it was aired as part of series runs in Australia and Great Britain). The series was noted for its edgy humor and star Matt Frewer's use of improvisation.