Mark Costello
Born
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Known For
Acting
Place of Birth
Paradise
Billionaire #1 · (1 episode)
7.7
2025
Charles Sloan
Charles Sloan
0.0
2023
Adult Swim Yule Log
Sheriff
6.3
2022
Yes, God, Yes
Priest
6.3
2020
Our Friend
Richard
7.2
2019
Doobious Sources
Blake Morgan
3.5
2017
Dead Silent
Will Hilton · (1 episode)
6.8
2016
Femme Fatales
Detective Mitchum · (1 episode)
6.4
2011
Turbulent Skies
Gardner
5.4
2010
Solar Flare
Dispatcher Howard
3.7
2008
An Accidental Christmas
5.6
2007
Locusts
Director Rusk
3.7
2005
The West Wing
Guest · (1 episode)
8.3
1999
7th Heaven
Ken · (1 episode)
6.4
1996
Zarkorr! The Invader
George Ray
4.5
1996
JAG
Otis Flannik · (1 episode)
7.3
1995
JAG
Wallace · (1 episode)
7.3
1995
JAG
Commander Onclay · (1 episode)
7.3
1995
ER
Kevin Halloran · (1 episode)
7.8
1994
Reasonable Doubts
Hanratty · (2 episodes)
7.2
1991
Tribes
Carl · (52 episodes)
5.0
1990
Full House
Anchorman · (1 episode)
7.5
1987
U.S. Marshals: Waco & Rhinehart
FBI Agent #1
0.0
1987
MacGyver
Cop · (1 episode)
7.7
1985
Crazy like a Fox
Nolan · (1 episode)
7.1
1984
Murder, She Wrote
Guard · (1 episode)
7.5
1984
Murder, She Wrote
Sgt. O'Connor · (1 episode)
7.5
1984
Murder, She Wrote
Officer · (1 episode)
7.5
1984
Hollywood Hot Tubs
Mr. Slate
3.5
1984
Hot Dog... The Movie
Event Starter
4.8
1984
Knots Landing
(1 episode)
6.8
1979