"The Adventures of Buckaroo Banzai" (1984), directed by W.D. Richter. 103 minutes. Rated PG-13. Forget Dick Tracy, Batman, et al. Buckaroo Banzai is the greatest comic-book hero who never was. When not fronting his band of New Jersey rock 'n' rollers, he's busy creating a device to penetrate the eighth dimension. It might take two or three viewings just to figure out what the heck is going on, but the ride is worth it.