Johnny Galecki

I'm Chevy Chase and You're Not

Self

2025

The Little Dog Laughed

Alex

2020

Stars in the House

Self

2020

Unraveling the Mystery: A Big Bang Farewell

Self - Host

2019

A Dog's Journey

Henry Montgomery

2019

The Conners

David Healy

2018

SciJinks

Self - Host

2018

The Cleanse

Paul Berger

2018

Rings

Gabriel Brown

2017

Must See TV: An All Star Tribute to James Burrows

Self

2016

The Late Show with Stephen Colbert

Self - Guest

2015

Lip Sync Battle

Self

2015

CBGB

Terry Ork

2013

In Time

Borel

2011

Conan

Self

2010

Table for Three

Ted

2009

Hancock

Jeremy

2008

The Big Bang Theory

Leonard Hofstadter

2007

My Name Is Earl

Scott

2005

American Dad!

Arnie (voice)

2005

Happy Endings

Miles (uncredited)

2005

The Late Late Show with Craig Ferguson

Self

2005

LAX

Leland Pressman

2004

Entourage

Johnny Galecki

2004

Chrystal

Barry

2004

Hope & Faith

Jay

2003

The Ellen DeGeneres Show

Self

2003

Bookies

Jude

2003

Vanilla Sky

Peter Brown

2001

Morgan's Ferry

Darcy

2001

Bounce

Seth

2000

Playing Mona Lisa

Arthur

2000

The Norm Show

Dale Stackhouse

1999

Family Guy

Leonard Hofstadter (voice)

1999

Batman Beyond

Knux (voice)

1999

The Opposite of Sex

Jason Bock

1998

I Know What You Did Last Summer

Max Neurick

1997

Suicide Kings

Ira Reder

1997

Bean

Stingo Wheelie

1997

Murder at My Door

Teddy McNair

1996

Without Consent

Marty

1994

Sudden Fury

Daniel Hannigan

1993

Billy

David MacGregor

1992

Civil Wars

Greg Stolbach

1991

Backfield in Motion

Tim Seavers

1991

In Defense of a Married Man

Eric

1990

American Dreamer

Danny Nash

1990

Blossom

Jason

1990

Blind Faith

John Marshall

1990

National Lampoon's Christmas Vacation

Rusty Griswold

1989

Prancer

Billy Quinn

1989

Hardball

1989

Roseanne

David Healy

1988

A Night in the Life of Jimmy Reardon

Toby Reardon

1988

Murder Ordained

Doug Rule

1987

Entertainment Tonight

Self

1981

People's Choice Awards

Self - Presenter

1975