As summer heat hangs over much of the U.S. it's time to cool off with a couple of off-beat productions this week. First there's 'The Runaways,' a high-octane musical biodrama about the first all-girl rock 'n' roll band that features stand-out performances by 'The Twilight Saga's' Kristen Stewart and Dakota Fanning. Then there's South Korean director Bong Joon-Ho's ("The Host") 'Mother,' a harrowing tale of a devoted mother who will do just about anything to prove that her retarded son didn't commit murder. And finally, a wonderful low-budget guilty pleasure sci-fi actioner produced by the Roger Corman factory comes to home video after too long an absence, 'Forbidden World.' Read on.