Filmography
| Year | Film | Role | Notes |
|---|---|---|---|
| 1972 | One Is a Lonely Number | (uncredited) | |
| 1973 | American Graffiti | Peg | (as Kathy Quinlan) |
| 1974 | Can Ellen Be Saved? | Melissa | (TV) |
| Lucas Tanner | Joyce Howell | (TV) | |
| Where Have All The People Gone? | Deborah Anders | (TV) | |
| 1974/1976 | The Waltons | Selina Linville | (2 episodes) |
| 1975 | The Missing Are Deadly | Michelle | (TV) |
| The Abduction of Saint Anne | Anne Benedict | (TV) | |
| The Turning Point of Jim Malloy | Edith Evans | (TV) | |
| 1976 | Lifeguard | Wendy | |
| 1977 | Little Ladies of the Night | Karen Brodwick | (TV) |
| Airport '77 | Julie | ||
| I Never Promised You a Rose Garden | Deborah Blake | Nominated — Golden Globe Award for Best Actress – Motion Picture Drama | |
| 1978 | Nightmare in Blood | ||
| 1979 | The Runner Stumbles | Sister Rita | |
| The Promise | Nancy McAllister/Marie Adamson | ||
| 1980 | Sunday Lovers | Laurie | (segment "Skippy") |
| 1981 | She's in the Army Now | Pvt. Cass Donner | (TV) |
| 1982 | Hanky Panky | Janet Dunn | |
| 1983 | Independence Day | Mary Ann Taylor | |
| Twilight Zone: The Movie | Helen Foley | (Segment #3) | |
| 1984 | The Last Winter | Joyce | |
| When She Says No | Rose Michaels | (TV) | |
| 1985 | Blackout | Chris Graham | (TV) MystFest Award for Best Actress |
| Warning Sign | Joanie Morse | ||
| Children of the Night | Lois Lee | (TV) | |
| 1986 | Man Outside | Grace Freemont | |
| 1987 | Wild Thing | Jane | |
| Dreams Lost, Dreams Found | Sarah McAllister | (TV) | |
| 1988 | Sunset | Nancy Shoemaker | |
| Clara's Heart | Leona Hart | ||
| 1989 | Trapped | Mary Ann Marshall | (TV) |
| 1990 | The Operation | Ginnie | (TV) |
| 1991 | The Doors | Patricia Kennealy | |
| Strays | Lindsey Jarrett | (TV) | |
| 1992 | An American Story | Hope Tyler | (TV) |
| 1993 | Stolen Babies | Bekka | (TV) |
| Last Light | Kathy Rubicek | (TV) | |
| 1994 | Trial by Jury (film) | Wanda | |
| 1995 | Apollo 13 | Marilyn Lovell | Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture Nominated — Academy Award for Best Supporting Actress Nominated — Golden Globe Award for Best Supporting Actress – Motion Picture Nominated — Chicago Film Critics Association Award for Best Supporting Actress |
| Perfect Alibi | Melanie Bauers | ||
| 1996 | In the Lake of the Woods | Kathy Waylan | (TV) |
| 1997 | Zeus and Roxanne | Mary Beth Dunhill | |
| Breakdown | Amy Taylor | ||
| Event Horizon | Peters, Med Tech | ||
| Lawn Dogs | Clare Stockard | ||
| 1998 | My Giant | Serena Kamin | |
| A Civil Action | Anne Anderson | ||
| 1999–2002 | Family Law | Lynn Holt | (TV Series) (68 episodes) |
| 1999 | Too Rich: The Secret Life of Doris Duke | Nanaline Duke | (TV) |
| 2003 | The Battle of Shaker Heights | Eve | |
| Blessings | Meredith Blessing | (TV) | |
| 2004 | Perfect Romance | Tess Kelley | (TV) |
| The Riverman | Sande Keppel | (TV) | |
| El Padrino | Judge Scorsi | ||
| The Dead Will Tell | Beth Hytner | (TV) | |
| 2006 | The Hills Have Eyes | Ethel Carter | |
| House | Arlene McNeil | Episode "Meaning" | |
| 2007 | American Fork | Agnes Orbison | |
| CSI: Crime Scene Investigation | Barbara Tallman | Episode "Monster in the Box" | |
| Breach | Bonnie Hanssen | ||
| Harm's Way | Bea | ||
| 2008 | Poundcake | Carol | |
| Made of Honor | Joan | ||
| 2008–2009 | Prison Break | Christina Rose Scofield | (7 episodes) |
| 2009 | Adult Film: A Hollywood Tale | Mary Bernstein | |
| Empire State | Colleen Cochrane | (TV) | |
| The River Why | Ma | ||
| 2011 | Cinema Verite | Mary | |
| Glee | Dr. Shane | Episode "Born This Way" |
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