Doom Droid was an Isotope-5 droid designed on Makeb. At some point during the Eternal Empire conquest the droid was obtained by the Eternal Empire and brought to Zakuul. The droid underwent modifications, which allowed it to be piloted by a Human mind instead of a droid brain. In 3632 BBY the mind of Arlaia Zayzen, a recently defeated gladiator in the Arena Grand, was snatched from the clutches of death and uploaded into the Doom Droid. With a new, completely robotic body, Arlaia tried to claim her revenge against "the Mysterious Stranger", but was defeated in round nine of the Arena fights.