“Men in Black II” (2002) assumes you saw the original, so it doesn’t spend a lot of time justifying all the aliens and strange plot twists. Actually, it doesn’t spend a lot of time doing anything. It’s barely over 90 minutes long. I will say this: As far as being a hybrid of sci-fi, action and buddy cop flicks, it does about as good a job as the original. Even the surprising undercurrent of poignancy remains, though barely. They just don’t seem to be trying very hard. Or maybe Will Smith and Tommy Lee Jones just make it look easy.