Desperate to turn the tide of a fierce battle on Malastare and win a strategic alliance with the Dugs, Chancellor Palpatine orders the Jedi to drop the Republic's newest super-weapon, an untested electro proton bomb. Unfortunately, the bomb's blast awakens an ancient and fearsome Zillo Beast, a monster of legendary size and ferocity. Now the Jedi must contain this deadly creature despite the interference of the bloodthirsty Dugs, who have their own agenda.

Per Palpatine's order, Republic forces transport a fearsome Zillo Beast back to Coruscant for scientific study. Eager to extract the beast's secrets for military gain, Palpatine orders his lead scientist to examine, and subsequently, kill the monster. Filled with pain and anger, the Zillo Beast escapes from the lab and begins devastating the city. Soon, Anakin, Padmé, and Palpatine find themselves pursued by the beast while the Jedi fight to contain it.