Loosely based on the story of Radio Caroline, one of England’s offshore commercial radio stations that thrived in the mid-60s, this 2009 comedy by writer-director Richard Curtis (Love Actually) manages to squander a wonderful premise, an excellent cast, and a killer soundtrack. Kenneth Branagh, wearing horn-rimmed glasses and a chevron moustache, is a starchy government minister who resolves to keep Britain tidy by shutting down the raucous Radio Rock, which broadcasts from the English Channel. This central conflict continually slips into the background, though, as Curtis enjoys himself with the motley crew of musical rebels aboard the floating station (among them Bill Nighy, Rhys Ifans, Nick Frost, and Philip Seymour Hoffman). Originally three hours long, the movie was pared down to 135 minutes for British release (as The Boat That Rocked) and again to 116 minutes for this U.S. version, but it’s still a hodgepodge of half-baked characters and story ideas, stoked by a frantic climax and a blue-chip playlist of 1966 rock classics.