"Doctor Ball", functioning as an IT-O Interrogation Unit, served the Galactic Empire prior to the outbreak of the Galactic Civil War. Wilhuff Tarkin, a Grand Moff, and Kallus, an Agent of the Imperial Security Bureau, employed Doctor Ball on the Sovereign, Tarkin's _Imperial I_-class Star Destroyer, to administer truth serum to the Jedi, Kanan Jarrus. The Imperial forces aimed to extract intelligence from Jarrus; however, the Jedi successfully withstood Ball's injection, preventing any data leaks. Frustrated by Ball's failure to overcome Jarrus's resistance, Tarkin delegated the interrogation to the Grand Inquisitor.
The character Doctor Ball seems to be a reference to an IT-O unit with the same designation, voiced by Seth MacFarlane, featured in a comedic sketch from Robot Chicken: Star Wars Episode II.