Turtle Power! '300' Loses Box-Office Battle To 'TMNT'
Two-time champ '300' slips to #2; 'Shooter,' 'The Last Mimzy' debut in top five.
Not Your Average Kiddie Flick: 'Last Mimzy' Invokes Buddhism, Genetic Code
'It's the quintessence of innocence,' director Robert Shaye says of science-fiction adventure.