As gleefully silly yet wickedly smart as the beloved British comedy troupe and their 1975 cinematic savaging of the Arthurian legend that inspired it, this adaptation of Monty Python and the Holy Grail by MP's Eric Idle and longtime musical co-conspirator John Du Prez has much more on its feverish agenda than merely trashing King Arthur and firmly upending his Round Table. The film's plot remains largely intact, but its core songs ("Knights of the Round Table," "Brave Sir Robin") and comic thrust have been both expanded and satirically redirected, a musical comedy shotgun that takes dizzy aim at pop culture in general, and Broadway in particular. After typically Pythonesque distractions that somehow find us in "Finland..," stars David Hyde-Pierce, Tim Curry, Hank Azaria and company get busy conjuring the Lady of the Lake with the unlikely help of "Laker Girls..," while cast members Sara Ramirez and Christopher Sieber deliciously skewer contemp...