In an alternative universe, the Eighth Doctor was a violent cyborg. He led an army that protected Earth from extraterrestrial threats. His right arm was a sonic weapon which he called a "sonic screwdriver". It had four settings: deafen, hurt, agonise, and liquify.
When the Praxxanoids tried to invade Earth, the Doctor led his soldiers onto the "alien scum's ship". As the Praxxanoids were gunned down, their leader Har approached the Doctor and surrendered. The Doctor replied that he couldn't "even spell the word" and proceeded to agonise Har with the sonic screwdriver. (COMIC: The Glorious Dead)