Meet the Spartans (2008)

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).