Video: Will Smith in 'Men In Black 3' trailer

In 'Men in Black 3', Agents J (Will Smith) and K (Tommy Lee Jones) are back.

J has seen some inexplicable things in his 15 years with the Men in Black, but nothing, not even aliens, perplexes him as much as his wry, reticent partner.

But when K's life and the fate of the planet are put at stake, Agent J will have to travel back in time to put things right. J discovers that there are secrets to the universe that K never told him.

The film is directed by Barry Sonnenfeld. The screenplay is written by Etan Cohen, based on the Malibu Comic by Lowell Cunningham.

The producers are Walter F Parkes and Laurie MacDonald, and the executive producers are Steven Spielberg and G Mac Brown.

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