After the original film showcased the fresh sounds and culture of collegiate a capella and the sequel amped up girl power in glorious fashion, Trish Sie’s Pitch Perfect 3 (C-) squanders the goodwill the musical comedy franchise has engendered with a denouement that temporarily turns the franchise into a head-scratching thriller before briefly returning to form for a tepid final bow. The Bellas are missing their fellas (would it have been too much to bankroll a Skylar Astin or Adam DeVine cameo?) and end up on a USO road show with a contrived competition, but thankfully the funny and talented Anna Kendrick and Rebel Wilson rise above the material. It seems they’d be fun just laughing together in a blank room. The film’s fictional bands don’t feel rooted in reality, the military subplots feel underdeveloped; and, as maestro of the film’s obligatory contest, DJ Khaled is so bad at playing himself that perhaps Christopher Plummer could have stepped in. John Lithgow’s character is a shark jumper in human form, and “Fat Amy” develops so many new superpowers, I half expected her to “Force project” herself through time and space. Of course the joy of these films is largely discovered in the quality of the musical sequences and droll comic lines, and there are enough here for fans to complete the viewing of the trilogy. There are also some occasional inside jokes that land like sweet lozenges amidst the hastily assembled script’s sore wanderlust. The series went from throw down to throwaway fast, but long live any entry into that adds Britney Spears and George Michael covers into its canon.