A researcher and engineer serving the Jedi Council, Doctor Gubacher was tasked with ensuring the droids attached to the Jedi Order were kept in optimum operational condition. With the outbreak of the Clone Wars, Gubacher was given special assignment to modify the droids for specific missions. The manic Parwan scientist developed the modifications required by the droids of D-Squad to carry out their mission to capture a vital Separatist encryption module.
Doctor Grubacher outfitted R2-D2 with enhanced booster rockets that enabled the droid to reach the heights of the cryo-chamber that contained the mission objective: a Separatist encryption module.
A pink-hued astromech droid, QT-KT was outfitted with a specialized magnetic coil vital for carrying out D-Squad's mission.
Another member of D-Squad was M5-BZ, a modified astromech droid with a hollowed out cranium that housed Colonel Gascon's command module.
The last member of D-Squad was U9-C4, an astromech modified with a powerful laser cutter needed to break into the comm vault of a Separatist dreadnought.