| Year | Title | Role | Notes |
| 1973 | The Brady Bunch | Millicent | Episode: "Never Too Young" |
| Shaft | Cathy Muder (uncredited) | Episode: "The Enforcers" |
| 1974–1981 | Little House on the Prairie | Mary Ingalls | Main role |
| 1976 | The Loneliest Runner | Nancy Rizzi | TV movie |
| 1977 | James at 15 | Lacey Stevens | Episode: "Pilot" |
| ABC Afterschool Special | Kate | Episode: "Very Good Friends" |
| 1978 | The Hanna-Barbera Happy Hour | Director of the musical | Episode No. 2 |
| 1978–1980 & 1986 | The Love Boat | Jennifer 'Chubs' Smith / Cindy Jerome / Cathy Cummings / Dana Colton | 4 episodes |
| 1979 | Survival of Dana | Dana Lee Gilbert | TV movie |
| ABC Afterschool Special | Alexandria 'Alex' Benton | Episode: "Which Mother Is Mine?" |
| A New Kind of Family | Lisa | Episode: "The Overcharge" |
| CHiPs | Herself | Episode: "Roller Disco" (Part 2) |
| 1980 | Fantasy Island | Amy Marson | Episode: "Rogues to Riches/Stark Terror" |
| Insight | Mary Beth | Episode: "Princess" |
| 1981 | Midnight Offerings | Vivian Sotherland | TV movie |
| Advice to the Lovelorn | Maureen Tyler |
| 1982 | An Innocent Love | Molly Rush |
| 1982–1983 | Spider-Man and His Amazing Friends | Kitty Pryde / Sprite | Voice, 2 episodes |
| 1983 | First Affair | Toby King | TV movie |
| 1984 | Finder of Lost Loves | Nikki Gatos | Episode: "Pilot" |
| Murder, She Wrote | Eve Crystal | Episode: "Hooray for Homicide" |
| Glitter | Elizabeth | Episode: "A Minor Miracle" |
| 1984–1985 | Hotel | Cassie Ray / Anne Goldman | 2 episodes |
| 1986 | Dark Mansions | Noelle Drake | TV movie |
| 1987 | The Equalizer | Yvette Marcel | 2 Episodes: "Memories of Manon: Parts 1 & 2" |
| 1988–1989 | Alfred Hitchcock Presents | Laura Donovan / Julie Fenton | 2 episodes |
| 1988 | The Equalizer | Yvette Marcel | 2 Episodes: "The Mystery of Manon: Parts 1 & 2" |
| 1989 | The Return of Sam McCloud | Colleen McCloud |
| 1993–1994 | X-Men: The Animated Series | Snowbird | Voice, 2 episodes |
| 1994 | Burke's Law | Michelle Ryder | Episode: "Who Killed Alexander the Great?" |
| 1998 | Earthquake in New York | Dr. Marilyn Blake | TV movie |
| 1999 | Partners | Cheryl Darrin | 3 episodes |
| 2000 | Thin Ice | Tanya Ferguson | TV movie |
| 2006 | Apocalypse | First Lady Megan Hollister | Miniseries |
| 2007 | Marco Polo | Mother | Voice, uncredited[citation needed] |
