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 Drew Massey Worm Guy #2 (voice) Aaron Serotsky Man in Black #1 Matthew Bates FBI HR Guy Stephen Wight Guy Brian Silliman Cabbie Jeff Kim Lead MIB Agent Michael Adams MIB Lead Interrogator Mike Capozzola Veteran MIB Agent Andrew Greenough Freddie the Alien Natasha Culzac Nightclub Waitress Vincent Pirillo MIB Security Guard