HomePeople Biography and filmographyLynn Mortensen Biography unavailable on TMDB. Movies (4)TV shows (0) Movies (4) Happy Anniversary, Charlie Brown1976 Be My Valentine, Charlie Brown1975 · Sally Brown (voice) It's the Easter Beagle, Charlie Brown1974 · Sally Brown / Violet / Frieda (voice) It's a Mystery, Charlie Brown1974 · Sally TV shows (0) No credits available.