The heroic Leonidas, armed with nothing by leather underwear and a cape, leads a ragtag group of 13 - count 'em, 13! - Spartans to defend their homeland against the invading Persians (whose ranks include Ghost Rider, Rocky Balboa, the Transformers, and a hunchbacked Paris Hilton...no one is safe when the Spartans take on the biggest icons in pop culture).