A detective story about the investigation of an environmental mystery: What was killing the seagrasses in the Chesapeake Bay, the country's largest and richest estuary? Beneath the surface of the Chesapeake Bay, in a twilight world where shafts of light barely pierce the water, a blanket of seagrasses once flourished. These grassbeds were feeding grounds for geese and wild swans and ducks.
When the magic powers of The Tablet of Ahkmenrah begin to die out, Larry Daley (Ben Stiller) spans the globe, uniting favorite and new characters while embarking on an epic quest to save the magic before it is gone forever.
Based on Frank Miller's latest graphic novel Xerxes and told in the breathtaking visual style of the blockbuster "300," this new chapter of the epic saga takes the action to a fresh battlefield--on the sea--as Greek general Themistokles attempts to unite all of Greece by leading the charge that will change the course of the war.