When the Zillo Beast is brought back to Coruscant in hopes of learning the secret of its impenetrable armour, it instead breaks loose and rampages across the ecumenopolis. As the clones prepare to kill it with poison gas, the Jedi are again trapped in a moral conflict between the value of its life and that of the planet's civilian populace.

Anakin Skywalker and Mace Windu are trapped in the crumbling ruins of a crashed ship while searching for survivors, and only R2-D2 can get out a message to save them—if he can elude vicious gundarks and, worse yet, a crew of determined bounty hunters led by Boba Fett and Aurra Sing.