Biography
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).
Acting credits 32 titles
Vicious
as Mother
Film
2025
6.0
National Memorial Day Concert
as Self
Film
2023
2.0
Heels
as Willie Day
Series
2021–2023
7.4
Unpregnant
as Debra Clarke
Film
2020
6.8
Treehouse
as Lilith
Film
2019
5.5
The Kids Are Alright
as Peggy Cleary
Series
2018–2019
6.9
Drone
as Ellen
Film
2017
5.3
Loaded
as Casey
Series
2017
6.4
Alien Code
as Rebecca
Film
2017
5.4
The Crash
as Sarah Schwab
Film
2017
4.5
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
Film
2016
7.8
A Country Called Home
as Amanda
Film
2016
5.3
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
Film
2014
7.3
Welcome to the Family
as Caroline Yoder
Series
2013
5.3
In Plain Sight
as Mary Shannon
Series
2008–2012
7.1
1408
as Lilly Enslin
Film
2007
6.7
Traffic
as Carole McKay
Series
2004
6.5
K Street
as Maggie Morris
Series
2003
4.9
Dickie Roberts: Former Child Star
as Grace Finney
Film
2003
5.1
Full Frontal
as Linda
Film
2002
4.6
K-PAX
as Rachel Powell
Film
2001
7.2
High Heels and Low Lifes
as Frances
Film
2001
6.1
Gun Shy
as Gloria Nesstra
Film
2000
5.2
Mystery, Alaska
as Donna Biebe
Film
1999
6.3
The West Wing
as Kate Harper
Series
1999–2006
8.3
True Crime
as Michelle Ziegler
Film
1999
6.5
Deep Impact
as Andrea Baker
Film
1998
6.3
Private Parts
as Alison Stern
Film
1997
6.5
Murder One
as Justine Appleton
Series
1995–1997
7.7
The Wright Verdicts
as Beth Eckhart
Series
1995
10.0
Backfire!
as Sarah
Film
1995
3.4
Miracle on 34th Street
as Myrna Foy
Film
1994
6.8
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Dikenal lewat
8.3
Series
The West Wing
Kate Harper
1999–2006
6.3
Film
Deep Impact
Andrea Baker
1998
7.7
Series
Murder One
Justine Appleton
1995–1997
7.1
Series
In Plain Sight
Mary Shannon
2008–2012
6.7
Film
1408
Lilly Enslin
2007
6.5
Film
True Crime
Michelle Ziegler
1999
6.0
Film
Vicious
Mother
2025
6.8
Film
Miracle on 34th Street
Myrna Foy
1994
7.2
Film
K-PAX
Rachel Powell
2001
7.4
Series
Heels
Willie Day
2021–2023
5.1
Film
Dickie Roberts: Former Child Star
Grace Finney
2003
6.3
Film
Mystery, Alaska
Donna Biebe
1999
7.3
Film
Scooby-Doo! WrestleMania Mystery
Ms. Richards (voice)
2014
3.4
Film
Backfire!
Sarah
1995
4.6
Film
Full Frontal
Linda
2002
6.1
Film
High Heels and Low Lifes
Frances
2001
6.5
Series
Traffic
Carole McKay
2004
4.9
Series
K Street
Maggie Morris
2003
5.2
Film
Gun Shy
Gloria Nesstra
2000
6.5
Film
Private Parts
Alison Stern
1997
6.8
Film
Unpregnant
Debra Clarke
2020
5.3
Series
Welcome to the Family
Caroline Yoder
2013
6.4
Series
Loaded
Casey
2017
6.9
Series
The Kids Are Alright
Peggy Cleary
2018–2019
10.0
Series
The Wright Verdicts
Beth Eckhart
1995
5.5
Film
Treehouse
Lilith
2019
4.5
Film
The Crash
Sarah Schwab
2017
2.0
Film
National Memorial Day Concert
Self
2023
5.3
Film
Drone
Ellen
2017
5.4
Film
Alien Code
Rebecca
2017
7.8
Film
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
Kay Larkin
2016
5.3
Film
A Country Called Home
Amanda
2016