With the objective of exterminating the entire Mon Calamari species, the Sith have created a semisentient bioweapon, a creature that can kill selectively. This Sith leviathan has already been unleashed on one underwater Mon Cal refugee camp, and it now swims the waters of Dac searching for more victims. The Mon Cal Rangers, with the help of Imperial Knight Treis Sinde, must find a way to destroy the leviathan before it clears the remaining Mon Calamarians from the galaxy forever!