Men in Black 3 - Interview with Barry Sonnenfield
Barry Sonnenfield explains Will Smith approched him with the idea of time travel on the set of Men In Black 2. The director says it was an easy choice to pick Josh Brolin for the role of younger Agent K.
In Men in Black™ 3, Agents J (Will Smith) and K (Tommy Lee Jones) are back... in time. 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 -- secrets that will reveal themselves as he teams up with the young Agent K (Josh Brolin) to save his partner, the agency, and the future of humankind. (Official Description)