Chris Hemsworth
Henry / Agent H

Tessa Thompson
Molly Wright / Agent M

Rebecca Ferguson
Riza Stavros

Kumail Nanjiani
Pawny (voice)

Rafe Spall
Agent C

Laurent Bourgeois
Alien Twin #1

Larry Bourgeois
Alien Twin #2

Emma Thompson
Agent O

Liam Neeson
Agent High T

Mandeiya Flory
Young Molly

Kayvan Novak
Vungus / Nasr / Bassam

Tim Blaney
Frank the Pug (voice)

Spencer Wilding
Luca Brasi

Marcy Harriell
Molly's Mom

Inny Clemons
Molly's Dad

Thom Fountain
Worm Guy #1 (voice)

Drew Massey
Worm Guy #2 (voice)

Aaron Serotsky
Man in Black #1

Matthew Bates
FBI HR Guy

Sartaj Garewal
CIA Recruiter

Stephen Wight
Guy

Brian Silliman
Cabbie

Jeff Kim
Lead MIB Agent

Michael Adams
MIB Lead Interrogator

Andrew Greenough
Freddie the Alien

Natasha Culzac
Nightclub Waitress

Paul Brennen
Alien Boss

Ania Sowinski
Alien Woman / Boss' Wife

Stefan Kalipha
Antique Shopkeeper

Daniel Scott-Smith
Nightclub Bartender

Vincent Pirillo
MIB Security Guard

Kaya Brown-Hallam
NIghtclub Patron #1

Beau Fowler
Nightclub Patron #2

Lukas DiSparrow
Nightclub Patron #3

Andy Beckwith
Viper Room Player

Romanos Blanco
Man at Eiffel Tower

Aistė Diržiūtė
Woman at Eiffel Tower

Anatole Taubman
French Salesman

Sorel Johnson
Nervous Forensic Tech

Paul Smith
Proprietor (Charlie)

Mike Capozzola
Veteran MIB Agent

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

Elle Black
Alien Dancer (uncredited)

Donald Glover
Alien on TV Monitor (uncredited)

Ariana Grande
Alien on TV Monitor (uncredited)

Elon Musk
Alien on TV Monitor (uncredited)

Hiten Patel
Tech Geek (uncredited)

Dimitri 'Vegas' Thivaios
Undercover Alien (uncredited)

Mike Lewis

Luke Johnson
Dancer (uncredited)

Rene Costa
Human Alien (uncredited)

Tiago Martins
Clubkid (uncredited)

Sérgio Mallandro
Himself (brazil version)