Doctor Krail's subpar group of combat automatons refers to a collection of altered battle droids made by Krail, a Doctor working for the Confederacy of Independent Systems, who anticipated substantial gains from these risky droid soldiers. Krail's expectation was that Clone Force 99, also known as the "Bad Batch" of clone troopers, would stumble upon his experiments, serving as the definitive assessment for his droids. Following intelligence about the modified droids reaching the Galactic Republic, the Bad Batch clone unit was Dispatched to Hylanth's moon located in the Outer Rim Territories. There, under instruction to locate and eliminate the droids, they faced their mechanical adversaries and engaged in a desperate fight for their lives.