Mary McCormack

February 8, 1969 (age 57) Plainfield, New Jersey, USA

Mary Catherine McCormack is an American actress. She has had leading roles as Justine Appleton on the series Murder One (1995–1997), as Deputy National Security Adviser Kate Harper on The West Wing (2004–2006), as Deputy U.S. Marshal Mary Shannon on In Plain Sight (2008–2012), and as Peggy on the comedy series The Kids Are Alright (2018–2019).

Her titles like 1408, K-PAX, and Deep Impact - her biggest roles first.
Last updated: August 16, 2026

Watched: 0/44

Weighted avg: 6.18 /10

1

1

1408

2007June 2007 by Mikael Håfström

Starring as Lilly Enslin

Starring as Lilly Enslin

6.25 Good--
2

2

K-PAX

2001October 2001 by Iain Softley

Starring as Rachel Powell

Starring as Rachel Powell

6.80 Good+
3

3

Deep Impact

1998May 1998 by Mimi Leder

Minor role as Andrea Baker

Minor role as Andrea Baker

5.76 Okay+
4

4

Miracle on 34th Street

1994November 1994 by Les Mayfield

Minor role as Myrna Foy

Minor role as Myrna Foy

6.31 Good--
5

5

True Crime

1999March 1999 by Clint Eastwood

Minor role as Michelle Ziegler

Minor role as Michelle Ziegler

6.06 Okay++
6

6

Right at Your Door

2006January 2006 by Chris Gorak

Lead role as Lexi

Lead role as Lexi

5.46 Okay
7

7

Private Parts

1997March 1997 by Betty Thomas

Starring as Alison Stern

Starring as Alison Stern

6.03 Okay++
8

8

Drone

2017May 2017 by Jason Bourque

Starring as Ellen

Starring as Ellen

4.94 Mediocre++
9

9

Mystery, Alaska

1999October 1999 by Jay Roach

Starring as Donna Biebe

Starring as Donna Biebe

5.84 Okay+
10

10

Vicious

2025August 2025 by Bryan Bertino

Starring as Mother

Starring as Mother

5.59 Okay
11

11

The West Wing

1999–2006 by Aaron Sorkin

Minor role as Kate Harper

Minor role as Kate Harper

7.51 Excellent-
12

12

Dickie Roberts: Former Child Star

2003September 2003 by Sam Weisman

Starring as Grace Finney

Starring as Grace Finney

4.85 Mediocre++
13

13

Scooby-Doo! WrestleMania Mystery

2014March 2014 by Brandon Vietti

Supporting as Ms. Richards (voice)

Supporting as Ms. Richards (voice)

6.81 Good+
14

14

Unpregnant

2020September 2020 by Rachel Lee Goldenberg

Supporting as Debra Clarke

Supporting as Debra Clarke

6.35 Good-
15

15

In Plain Sight

2008–2012 by David Maples

Lead role as Mary Shannon

Lead role as Mary Shannon

6.04 Okay++
16

16

Heels

2021–2023 by Michael Waldron

Supporting as Willie Day

Supporting as Willie Day

6.40 Good-
17

17

Treehouse

2019March 2019 by James Roday Rodriguez

Starring as Lilith

Starring as Lilith

5.36 Okay-
18

18

Full Frontal

2002August 2002 by Steven Soderbergh

Supporting as Linda

Supporting as Linda

4.66 Mediocre+
19

19

High Heels and Low Lifes

2001July 2001 by Mel Smith

Starring as Frances

Starring as Frances

5.84 Okay+
20

20

Gun Shy

2000February 2000 by Eric Blakeney

Minor role as Gloria Nesstra

Minor role as Gloria Nesstra

4.99 Mediocre++
21

21

Alien Code

2017April 2017 by Michael G. Cooney

Starring as Rebecca

Starring as Rebecca

5.31 Okay-
22

22

The Broken Hearts Club: A Romantic Comedy

2000February 2000 by Greg Berlanti

Minor role as Anne

Minor role as Anne

5.88 Okay+
23

23

The Crash

2017January 2017 by Aram Rappaport

Supporting as Sarah Schwab

Supporting as Sarah Schwab

4.90 Mediocre++
24

24

A Country Called Home

2016February 2016 by Anna Axster

Starring as Amanda

Starring as Amanda

5.47 Okay
25

25

Escape from Polygamy

2013August 2013 by Rachel Lee Goldenberg

Starring as Leann

Starring as Leann

6.12 Good--
26

26

Madison

2005April 2005 by William Bindley

Starring as Bonnie McCormick

Starring as Bonnie McCormick

5.71 Okay+
27

27

Murder One

1995–1997 by Channing Gibson

Supporting as Justine Appleton

Supporting as Justine Appleton

6.37 Good-
28

28

The Big Tease

1999November 1999 by Kevin Allen

Starring as Monique

Starring as Monique

5.80 Okay+
29

29

The Kids Are Alright

2018–2019 by Tim Doyle

Supporting as Peggy Cleary

Supporting as Peggy Cleary

5.93 Okay++
30

30

Loaded

2017

Supporting as Casey

Supporting as Casey

5.78 Okay+
31

31

World Traveler

2002April 2002 by Bart Freundlich

Supporting as Margaret

Supporting as Margaret

5.18 Okay--
32

32

The Alarmist

1998October 1998 by Evan Dunsky

Supporting as Sally

Supporting as Sally

5.39 Okay-
33

33

K Street

2003 by Steven Soderbergh

Lead role as Maggie Morris

Lead role as Maggie Morris

Needs more reviews
34

34

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

2016November 2016 by Valerie Weiss

Starring as Kay Larkin

Starring as Kay Larkin

6.29 Good--
35

35

Other Voices

2000January 2000 by Dan McCormack

Starring as Anna

Starring as Anna

5.54 Okay
36

36

Welcome to the Family

2013 by Mike Sikowitz

Starring as Caroline Yoder

Starring as Caroline Yoder

Needs more reviews
37

37

Traffic

2004 by Graham King

Supporting as Carole McKay

Supporting as Carole McKay

Needs more reviews
38

38

Harvest

1999March 1999 by Stuart Burkin

Lead role as Agent Becka Anslinger

Lead role as Agent Becka Anslinger

Needs more reviews
39

39

BigLove

2001January 2001 by Leif Tilden

Starring as Phoebe

Starring as Phoebe

Needs more reviews
40

40

Backfire!

1995January 1995 by A. Dean Bell

Supporting as Sarah

Supporting as Sarah

Needs more reviews
41

41

Getting to Know You

1999January 1999 by Lisanne Skyler

Supporting as Leila Lee

Supporting as Leila Lee

Needs more reviews
42

42

Colin Fitz

1997January 1997 by Robert Bella

Minor role as Moira

Minor role as Moira

Needs more reviews
43

43

Should've Been Romeo

2012April 2012 by Marc Bennett

Minor role as Ellen

Minor role as Ellen

Needs more reviews
44

44

The Wright Verdicts

1995 by Dick Wolf

Supporting as Beth Eckhart

Supporting as Beth Eckhart

Needs more reviews