Midnight Blue, Vol. 4: Freaks & Geeks is a lesser but still interesting entry in this compilation series from Blue Underground. As the title would suggest, Vol. 4 focuses on the kinkier side of the show. The end result is a hit-and-miss volume because what was shocking in the mid-'70s and early '80s isn't as shocking as it once was; for instance, a segment that deals with nipple piercing probably won't make anyone who's ever seen an episode of Real Sex bat an eyelash. That said, when this collection hits on a good segment, the results are memorable; highlights include Al Goldstein jeering at Ron Jeremy as he uses paint to make prints with a sensitive part of his anatomy and a hilarious interview of a rather touchy and all-too-intense S & M mistress. Ultimately, a viewer's interest in Midnight Blue, Vol. 4: Freaks & Geeks will depend on his or her level of fascination with the show and the subcultures it depicts. It is definitely not a general-interest item but might serve as an interesting time capsule for those amused by the adult entertainment business.