"Grathan's people—took us prisoner for experiments. The scientists cut open our heads, put us in droids. Identification: Model OHK-99."
―Tholver Shan[src]

The OHK-99 was a model of battle droid built by Grathan's scientists that were in fact Human soldiers converted into droids. Tholver Shan and a number of other soldiers were captured by Grathan's forces and converted to OHK-99 units.