Chris Hemsworth as Henry / Agent H

Tessa Thompson as Molly Wright / Agent M

Rebecca Ferguson as Riza Stavros

Kumail Nanjiani as Pawny (voice)

Rafe Spall as Agent C

Laurent Bourgeois as Alien Twin #1

Larry Bourgeois as Alien Twin #2

Emma Thompson as Agent O

Liam Neeson as Agent High T

Mandeiya Flory as Young Molly

Kayvan Novak as Vungus / Nasr / Bassam

Annie Burkin as Nerlene

Tim Blaney as Frank the Pug (voice)

Spencer Wilding as Luca Brasi

Marcy Harriell as Molly's Mom

Inny Clemons as Molly's Dad

Thom Fountain as Worm Guy #1 (voice)

Drew Massey as Worm Guy #2 (voice)

Aaron Serotsky as Man in Black #1

Matthew Bates as FBI HR Guy

Sartaj Garewal as CIA Recruiter

Stephen Wight as Guy

Brian Silliman as Cabbie

John Sousa as Jimmy the Alien

Jeff Kim as Lead MIB Agent

Michael Adams as MIB Lead Interrogator

Andrew Greenough as Freddie the Alien

Natasha Culzac as Nightclub Waitress

David Hartley as MIB Forensics Agent

Paul Brennen as Alien Boss

Ania Sowinski as Alien Woman / Boss' Wife

Stefan Kalipha as Antique Shopkeeper

Daniel Scott-Smith as Nightclub Bartender

Vincent Pirillo as MIB Security Guard

Kaya Brown-Hallam as NIghtclub Patron #1

Beau Fowler as Nightclub Patron #2

Lukas DiSparrow as Nightclub Patron #3

Andy Beckwith as Viper Room Player

Romanos Blanco as Man at Eiffel Tower

Aistė Diržiūtė as Woman at Eiffel Tower

Anatole Taubman as French Salesman

Sorel Johnson as Nervous Forensic Tech

Paul Smith as Proprietor (Charlie)

Mike Capozzola as Veteran MIB Agent

J.J. Abrams as Alien on TV Monitor (uncredited)

Elle Black as Alien Dancer (uncredited)

Donald Glover as Alien on TV Monitor (uncredited)

Ariana Grande as Alien on TV Monitor (uncredited)

Elon Musk as Alien on TV Monitor (uncredited)

Hiten Patel as Tech Geek (uncredited)

Dimitri 'Vegas' Thivaios as Undercover Alien (uncredited)

Mike Lewis as

Luke Johnson as Dancer (uncredited)

Rene Costa as Human Alien (uncredited)

Tiago Martins as Clubkid (uncredited)

Luigi Boccanfuso as Horns

Sérgio Mallandro as Himself (brazil version)