Sequels to fish-out-of-water comedies make progressively less sense the longer a series continues. By the time Crocodile Dundee In Los Angeles rolled around in 2001, 15 years after the first Crocodile Dundee became a surprise blockbuster, the title character had been given an awfully long time to grow acclimated to those kooky Americans. Men In Black 3 finagles its way out of this predicament by literally resetting the clock with a time-travel premise that makes Will Smith both a contemporary intergalactic cop in the late 1960s and a stranger to Josh Brolin, who plays the younger version of Smith’s stone-faced future partner, Tommy Lee Jones.
Source: wiktionary