This is one of the most obvious titles on the list since the closing credits promised us 'Buckaroo Banzai Vs The World Crime League', and while the first film was a cult item at best, the influence that the film has had in pop culture is so deep that at this point, it could be one of those cases where the sequel is much bigger than the original.  Fox has flirted with revisiting the characters and the world several times, but they've never quite made it to camera with any of the versions.  You could still put this cast back together and have some great fun with them, especially with the time that's passed.  But the clock's ticking, and I'm started to think we've seen all the Lectroids we're ever going to see.