Will Smith

Character: Agent J

Tommy Lee Jones

Character: Agent K

Josh Brolin

Character: Young Agent K

Jemaine Clement

Character: Boris The Animal

Emma Thompson

Character: Agent O

Michael Stuhlbarg

Character: Griffin

Mike Colter

Character: Colonel

Nicole Scherzinger

Character: Boris's Girlfriend

Michael Chernus

Character: Jeffrey Price

Alice Eve

Character: Young Agent O

David Rasche

Character: Agent X

Keone Young

Character: Mr. Wu

Bill Hader

Character: Andy Warhol

Cayen Martin

Character: Colonel's Son

Clarke Thorell

Character: Prison Guard #1

Adam Mucci

Character: Prison Guard #2

Tom McComas

Character: Prison Guard #3

Douglas Crosby

Character: Prison Guard #4

Woodie King Jr.

Character: 2012 MIB HQ Guard

Jack O'Connell

Character: 1969 MIB HQ Guard

Tobias Segal

Character: 1969 MIB Agent #1

Jon Shaver

Character: 1969 MIB Agent #2

Gerritt Vandermeer

Character: 1969 MIB Agent #3

Alexandra O'Hara

Character: Mom

Violet O'Hara

Character: Little Chocolate Milk Girl

Valence Thomas

Character: Coney Island Hippie

Chloe Sonnenfeld

Character: Coney Island Flower Child

Lanny Flaherty

Character: Obadiah Price

Jonathan O'Hara

Character: MIB Desk Agent

Rick Baker

Character: Brain Alien

Joseph D'Onofrio

Character: New York Mets Fan #1

Joseph R. Gannascoli

Character: New York Mets Fan #2

Katy Frame

Character: Diner Waitress

Kevin Townley

Character: Funky 60's Dude

Stephen Brian Jones

Character: Guru

Tyler Johnson

Character: Muscle Boy at Happening

Kati Rediger

Character: Muscle Boy's Girlfriend at Happening

Victor Joel Ortiz

Character: Air Force MP #1

Charlie Barnett

Character: Air Force MP #2

Ian Blackman

Character: Car Theft Victim

Jeremy Beiler

Character: Hotel Doorman

Liliane Klein

Character: Screaming Lady on Ferris Wheel

Britt Chandler Johnson

Character: Detained Teenage Alien

Jared Johnston

Character: Neil Armstrong

Ken Arnold

Character: Buzz Aldrin

Jonathan Drew

Character: Michael Collins

Joel Brady

Character: 1969 Man in Elevator

David Pittu

Character: Roman The Fabulist

Lenny Venito

Character: Bowling Ball Head

Anthony J. Gallo

Character: Four-Armed Alien

James Martin Kelly

Character: 1969 NYPD Cop #1

Will McLaughlin

Character: 1969 NYPD Cop #2

Kimmy Suzuki

Character: Mr. Wu's Bartender

Kirk Larsen

Character: Dead Zed

Rebecca Glasscock

Character: Transvestite at Happening

Barry Sonnenfeld

Character: Husband Watching Launch

Susan Ringo

Character: Wife Watching Launch

Stephanie Ellis

Character: Young Wife #1 Watching Launch

Ben Mac Brown

Character: Young Husband #1 Watching Launch

Amy Erwitt

Character: Young Wife #2 Watching Launch

Brad Abrell

Character: Worm (voice)

Tim Blaney

Character: Worm (voice)

Thom Fountain

Character: Worm (voice)

Carl J. Johnson

Character: Worm (voice)

Will Arnett

Character: Agent AA (uncredited)

Jada Pinkett Smith

Character: Party Guest (uncredited)

Tony Shalhoub

Character: 1969 Newsstand Vendor (uncredited)

Alex Ziwak

Character: Prisoner (uncredited)

Jason Liles

Character: Feelers / Colussus (uncredited)

Jesse Ridgway

Character: Pedestrian (uncredited)

Justin Bieber

Character: Alien on TV Monitors (uncredited)

Erin Lindsey Krom

Character: Headquarters Secretary (uncredited)

Tim Burton

Character: Alien on TV Monitors (uncredited)

Eha Urbsalu

Character: 1969 MIB Secretary #1 (uncredited)

Rip Torn

Character: Large-Headed Alien at Funeral (uncredited)

Howard Stern

Character: 1969 Man in MIB HQ (uncredited)

Alpheus Merchant

Character: MIB Guard (uncredited)

Leonard Zimmerman

Character: Warhol Benefactor (uncredited)

Liz Logan

Character: Coney Island Sunbather (uncredited)