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Acting
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).
Vicious
as Mother
The Pitt
as Dr. Linda Conley
National Memorial Day Concert
as Self
Heels
as Willie Day
Unpregnant
as Debra Clarke
The L Word: Generation Q
as Anne Finley
Still Laugh-In: The Stars Celebrate
as Self
Treehouse
as Lilith
The Kids Are Alright
as Peggy Cleary
25 Words or Less
as Self
For the People
as Chloe Daniels
Will & Grace
as Janet
Drone
as Ellen
Loaded
as Casey
Alien Code
as Rebecca
The Crash
as Sarah Schwab
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
Divorce
as Kathy DeSantis
Match Game
as Self - Panelist
To Tell the Truth
as Self - Panelist
Chelsea
as Self
A Country Called Home
as Amanda
Chelsea Does
as Herself
Angie Tribeca
as Abigail Liukin
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
Welcome to the Family
as Caroline Yoder
Escape from Polygamy
as Leann
The Newsroom
as Molly Levy
Should've Been Romeo
as Ellen
Scandal
as Lisa Elliot
House of Lies
as Denna Altshuler
The Unprofessional
as Hilary Pfeiffer-Dunne
Watch What Happens Live with Andy Cohen
as Self - Guest
Late Night with Jimmy Fallon
as Self
In Plain Sight
as Mary Shannon
1408
as Lilly Enslin
For Your Consideration
as Pilgrim Woman
Right at Your Door
as Lexi
Madison
as Bonnie McCormick
The Late Late Show with Craig Ferguson
as Self
Traffic
as Carole McKay
K Street
as Maggie Morris
The Ellen DeGeneres Show
as Self
Dickie Roberts: Former Child Star
as Grace Finney
Jimmy Kimmel Live!
as Self
Full Frontal
as Linda
World Traveler
as Margaret
K-PAX
as Rachel Powell
Law & Order: Criminal Intent
as Mary Shannon
High Heels and Low Lifes
as Frances
BigLove
as Phoebe
East of A
as Daphne
Gun Shy
as Gloria Nesstra
The Broken Hearts Club: A Romantic Comedy
as Anne
Other Voices
as Anna
The Big Tease
as Monique
Mystery, Alaska
as Donna Biebe
The West Wing
as Kate Harper
The Late Late Show with Craig Kilborn
as Self - Guest
True Crime
as Michelle Ziegler
