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Smallville

2001
as Lionel Luthor

Batman: The Animated Series

1992
as Edward Nygma / The Riddler

Brimstone

1998
as The Devil

Twist of Fate

1989
as Max Brodsky

Haunted History

1999
as Narrator

Search for Tomorrow

1951
as Billy Vargas

Guest Star

Episode Brothers & Sisters
Owning It
2009
Episode Homicide: Life on the Street
Lies and Other Truths
1998
Episode The Blacklist
Berlin
2014
Episode Batman: The Animated Series
If You're So Smart, Why Aren't You Rich?
1992
Episode Batman Shadows
The Riddler
2024
Episode Snoops (1999)
Pilot
1999
Episode Smallville
Jitters
2001
Episode The Ray Bradbury Theater
Silent Towns
1992
Episode Numb3rs
Trouble in Chinatown
2009
Episode The New Batman Adventures
Judgment Day
1998
Episode Remember WENN
Hilary Booth, Registered Nurse
1996
Episode Smallville
Shimmer
2002
Episode Murder, She Wrote
When Thieves Fall Out
1987
Episode Caroline in the City
Caroline and the Dearly Departed
1997
Episode Star Trek: Deep Space Nine
Invasive Procedures
1993
Episode Miami Vice
Lend Me an Ear
1987
Episode Smallville
Luthor
2010
Episode L.A. Law
God Rest Ye Little Gentleman
1990
Episode Batman: The Animated Series
Riddler's Reform
1994
Episode Inside Of You
John Glover
2019
Episode Brimstone
It's a Helluva Life
1999
Episode Perception
Possession
2014
Episode Smallville
Pilot
2001
Episode The Twilight Zone (1985)
A Small Talent for War
1986
Episode Batman: The Animated Series
What is Reality?
1992
Episode Frasier
Oops
1993
Episode Chicago Hope
Objects are Closer Than They Appear
1998
Episode Smallville
Stray
2002
Episode Numb3rs
Mind Games
2006
Episode Tales from the Crypt
Undertaking Palor
1991
Episode Heroes
Shades of Gray
2009
Episode Pinky and the Brain
Pinky's Turn
1998
Episode Smallville
Reaper
2002
Episode Smallville
Crush
2002
Episode Murder, She Wrote
One White Rose for Death
1986
Episode Animaniacs
Nothing but the Tooth
1993
Episode RiffTrax
Batman and Robin
2008
Episode Smallville
Tempest
2002
Episode Law & Order: Criminal Intent
Frame
2008
Episode Superman: The Animated Series
Knight Time
1998
Episode The Good Wife
Rape: A Modern Perspective
2013
Episode American Dreamer
They Shoot Ducks, Don't They?
1991
Episode Inside Of You
My Smallville Father JOHN GLOVER
2021
Episode Law & Order: Criminal Intent
Blind Spot
2006