Will Smith returns as Agent J, with Tommy Lee Jones and Josh Brolin as Agent K (old and young) in the time-travel sequel Men in Black 3.
Main cast
- Agent JWill SmithMain
- Agent K (older)Tommy Lee JonesMain
- Agent K (younger)Josh BrolinMain
Supporting cast
- Boris the AnimalJemaine ClementSupp
- Agent OEmma ThompsonSupp
- Agent O (younger)Alice EveSupp
- Griffin (the Archanan)Michael StuhlbargSupp
- Colonel / Agent XMike ColterSupp
Guest & voice
- Frank the PugTim BlaneyVoice
- Agent Zed (archive footage)Rip TornGuest
- Andy Warhol / Agent WBill HaderGuest
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About this cast
The third Men in Black film sees Agent J travel back to 1969 to prevent an alien assassin from murdering his partner Agent K, changing history. Josh Brolin plays the younger K with a spot-on impression of Tommy Lee Jones, alongside Will Smith’s J and Jemaine Clement as the villain Boris the Animal.
FAQs
Who plays Agent J in Men in Black 3?
Will Smith reprises his role as Agent J, the main protagonist of the series.
Why is Tommy Lee Jones not in most of Men in Black 3?
The plot involves time travel, so the older Agent K (Tommy Lee Jones) is erased from history for much of the film. Josh Brolin plays the younger K in his place.
What does Boris the Animal want in Men in Black 3?
Boris the Animal (Jemaine Clement) is an alien criminal seeking revenge on Agent K for imprisoning him in 1969 and removing his arm.
Who plays the younger Agent O in Men in Black 3?
Alice Eve plays the younger version of Agent O, who later becomes head of MiB (played by Emma Thompson in the present).
Is Bill Hader in Men in Black 3?
Yes, Bill Hader makes a cameo as Andy Warhol, who is revealed to be an MiB agent codenamed Agent W.
Sources & where to watch: Where to watch (JustWatch UK) · Updated June 2026