The Timber Lake Playhouse's production of Bat Boy the Musical features a cast of 15 playing some two dozen characters, more than a fifth of whom will be dead by the curtain call. Necks are bitten, throats are slashed, overdoses are administered, and through it all, Bat Boy's performers look as though they couldn't possibly be having more fun. En masse, Timber Lake's ensemble just might compose the happiest musical cast I've seen all year, and considering the material they're working with, and the director they're working for, how could they be anything less?