When the Riddler escapes from Arkham Asylum, the Dynamic Duo discover he has a museum in his sights. But the Riddler's riddles reveal he doesn't just steal from the museum; he actually makes off with the whole thing! With the help of World War II-era decoding machines, the Riddler takes command of the Gotham City Military Museum - a fully-functional battleship! Now it's up to Batman and Robin spoil his plans before he blows Wayne Manor - and the rest of Gotham City - out of the water.