In Men in Black 3, once again Earth is in imminent danger of an alien invasion and once again, there is a city-wide dragnet for an alien. The twist this time round is it's not so much where the alien is hiding but when.
Yes, there is a time travel element in MIB3, which also ties in with a key highlight of the MIB series — the double act where Tommy Lee Jones plays the sour prune straight man and Will Smith applies his natural talent as the funny man. Since our hero goes back into the past to save the existence of the Earth (as well as that of Agent K) from a time travelling alien villain, the film has great fun casting Josh Brolin as the younger K. Half of the fun in this film is watching Brolin imitate Tommy Lee Jones better than Tommy Lee Jones can perform Agent K. The other half consists of watching the younger versions of everyone else in the MIB bureau, as well as laughing at what the bureau thought to be high technology in the 1960s.
While MIB3 doesn't really push the envelope in terms of comedy or storytelling, it does mark a return to form for the series. Plus, it's a relief to see Will Smith doing comedy again.