“Roller Squad” (*1/2 out of four) was a grindingly dumb comedy thriller about a group of roller-skating friends (Alice Sanders, Benjamin McMahon, Amy Newton, and others) who join forces to try and catch a serial killer who is too fast for the police and who keeps eluding public view. Strictly for those who can’t wait for “Roller Derby” re-runs or who thought “The Mighty Morphin Power Rangers” series was too artistic or intellectually challenging; tough skating for anyone else. This dud is unlikely to lead to a resurgence of roller-skating anytime soon.