Mary McCormack

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).

Known for

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Unpregnant

2020 ⭐ 6.8

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An American Girl Story: Maryellen 1955 - Extraordinary Christmas

2016 ⭐ 7.8

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Scooby-Doo! WrestleMania Mystery

2014 ⭐ 7.3

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Escape from Polygamy

2013 ⭐ 6.8

Career timeline

2025

Vicious

Mother · 2025

⭐ 5.9

2023

National Memorial Day Concert

Self · 2023

⭐ 2.0

2020

Unpregnant

Debra Clarke · 2020

⭐ 6.8

2019

Still Laugh-In: The Stars Celebrate

Self · 2019

⭐ 5.3

Treehouse

Lilith · 2019

⭐ 5.5

2017

Drone

Ellen · 2017

⭐ 5.3

Alien Code

Rebecca · 2017

⭐ 5.4

The Crash

Sarah Schwab · 2017

⭐ 4.5

2016

An American Girl Story: Maryellen 1955 - Extraordinary Christmas Notable

Kay Larkin · 2016

⭐ 7.8

A Country Called Home

Amanda · 2016

⭐ 5.3

2014

Scooby-Doo! WrestleMania Mystery Notable

Ms. Richards (voice) · 2014

⭐ 7.3

2013

Escape from Polygamy

Leann · 2013

⭐ 6.8

2012

Should've Been Romeo

Ellen · 2012

⭐ 4.3

2007

1408 Notable

Lilly Enslin · 2007

⭐ 6.7

2006

For Your Consideration

Pilgrim Woman · 2006

⭐ 5.8

Right at Your Door

Lexi · 2006

⭐ 5.8

2005

Madison

Bonnie McCormick · 2005

⭐ 5.8

2003

Dickie Roberts: Former Child Star

Grace Finney · 2003

⭐ 5.1

2002

Full Frontal

Linda · 2002

⭐ 4.6

World Traveler

Margaret · 2002

⭐ 4.1

2001

K-PAX Notable

Rachel Powell · 2001

⭐ 7.2

High Heels and Low Lifes

Frances · 2001

⭐ 6.2

BigLove Notable

Phoebe · 2001

⭐ 7.5

2000

Gun Shy

Gloria Nesstra · 2000

⭐ 5.2

The Broken Hearts Club: A Romantic Comedy

Anne · 2000

⭐ 6.3

Other Voices

Anna · 2000

⭐ 4.0

1999

The Big Tease

Monique · 1999

⭐ 5.9

Mystery, Alaska

Donna Biebe · 1999

⭐ 6.3

True Crime

Michelle Ziegler · 1999

⭐ 6.5

1998

The Alarmist

Sally · 1998

⭐ 4.5

54

New Year's Eve Wife (uncredite · 1998

⭐ 5.9

Deep Impact Notable

Andrea Baker · 1998

⭐ 6.2

1997

Murder One: Diary of a Serial Killer Notable

Justine Appleton · 1997

⭐ 7.0

Fathers' Day

Virginia Farrell (uncredited) · 1997

⭐ 5.5

Private Parts

Alison Stern · 1997

⭐ 6.5

1995

Backfire!

Sarah · 1995

⭐ 3.6

Frequently appears with

Haley Lu Richardson

Veronica Clarke

Barbie Ferreira

Bailey Butler

Giancarlo Esposito

Bob

Alex MacNicoll

Kevin

Breckin Meyer

Mark

Alyvia Alyn Lind

Maryellen Larkin

Madison Lawlor

Joan Larkin

Maxwell Acee Donovan

Davy Fenstermacher

Samuel Faraci

Benji

Full filmography

HD

Vicious

2025 ⭐ 5.9

HD

National Memorial Day Concert

2023 ⭐ 2.0

HD

Unpregnant

2020 ⭐ 6.8

HD

Still Laugh-In: The Stars Celebrate

2019 ⭐ 5.3

HD

Treehouse

2019 ⭐ 5.5

HD

Drone

2017 ⭐ 5.3

HD

Alien Code

2017 ⭐ 5.4

HD

The Crash

2017 ⭐ 4.5

HD

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

2016 ⭐ 7.8

HD

A Country Called Home

2016 ⭐ 5.3

HD

Scooby-Doo! WrestleMania Mystery

2014 ⭐ 7.3

HD

Escape from Polygamy

2013 ⭐ 6.8

HD

Should've Been Romeo

2012 ⭐ 4.3

HD

1408

2007 ⭐ 6.7

HD

For Your Consideration

2006 ⭐ 5.8

HD

Right at Your Door

2006 ⭐ 5.8

HD

Madison

2005 ⭐ 5.8

HD

Dickie Roberts: Former Child Star

2003 ⭐ 5.1

HD

Full Frontal

2002 ⭐ 4.6

HD

World Traveler

2002 ⭐ 4.1