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Charles Peckham Day (born February 9, 1976) is an American actor, writer, and producer. He is best known for playing Charlie Kelly on the FX/FXX dark comedy It's Always Sunny in Philadelphia (2005–present), of which he is also a writer and an executive producer. In 2011, he was nominated for a Critics' Choice Television Award and a Satellite Award for the role. Subsequently, he co-created the Apple TV+ comedy Mythic Quest (2020–2025) with Rob Mac and Megan Ganz. In film, Day is best known for his performances as Dr. Newton Geiszler in Guillermo del Toro's Pacific Rim (2013), Dale Arbus in the comedy Horrible Bosses (2011) and its sequel Horrible Bosses 2 (2014), and Andy Campbell in the comedy Fist Fight (2017). He is also known for his voice roles in Monsters University (2013), The Lego Movie film franchise (2014–2019) and Nintendo franchise character Luigi in The Super Mario Bros. Movie (2023) and its sequel, The Super Mario Galaxy Movie (2026). He made his directorial debut with Fool's Paradise (2023). Description above from the Wikipedia article Charlie Day, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Wildwood
as Seamus (voice)

The Super Mario Galaxy Movie
as Luigi (voice)

Kill Me
as Jimmy

Honey Don't!
as Marty Metakawitch
PaleyLive: It’s Always Sunny in Philadelphia 20th Anniversary Celebration!
as Self

Summer of 69
as Rick Richards

Hot Ones Versus
as Self

The Saint of Second Chances
as Mike Veeck

Fool's Paradise
as Latte Pronto

Bupkis
as Glen Rossi

The Super Mario Bros. Movie
as Luigi (voice)

Welcome to Wrexham
as Self

I Want You Back
as Peter

Abbott Elementary
as Charlie

How It Ends
as Lonny

Snacked
as Self

Mythic Quest
as Spencer

The Kelly Clarkson Show
as Self - Guest

The Lego Movie 2: The Second Part
as Benny (voice)

Emmet's Holiday Party: A LEGO Movie Short
as Benny (voice)

The Cool Kids
as Chet the Handyman

Hotel Artemis
as Acapulco

Pacific Rim: Uprising
as Dr. Newton Geiszler

I Love You, Daddy
as Ralph Kinder

Fist Fight
as Andy Campbell

The Hollars
as Jason

The Late Show with Stephen Colbert
as Self

Vacation
as Chad

Hot Ones
as Self

Horrible Bosses 2
as Dale Arbus

The Emmet Awards Show!
as Benny (voice / uncredited / archive footage)

Party Central
as Art (voice)

The Tonight Show Starring Jimmy Fallon
as Self

The Lego Movie
as Benny (voice)

Rick and Morty
as Salva-tron (voice)

Pacific Rim
as Dr. Newton Geiszler

Monsters University
as Art (voice)

Unsupervised
as Jesse Judge (Voice)

Horrible Bosses
as Dale Arbus
Going the Distance: A Guide to Long Distance Dating
as Self
Going the Distance: How to Have a Perfect Date
as Self

Conan
as Self

Going the Distance
as Dan Grant

A Very Sunny Christmas
as Charlie Kelly

The Nightman Cometh: Live
as Charlie Kelly

A Quiet Little Marriage
as Adam

Free Radio
as Self

It's Always Sunny in Philadelphia
as Charlie Kelly

American Dad!
as Jon (Voice)

Love Thy Neighbor
as Video Clerk

Luis
as Richie

Reno 911!
as Inbred Twin

Jimmy Kimmel Live!
as Self

Late Summer
as Trevor

Campfire Stories
as Joe

Madigan Men

Mary and Rhoda
as Mailroom Kid

Third Watch
as Michael Boscorelli

The View
as Self - Guest

Raw
as Self