Kaagh Commander Kaagh , also called Kaagh the Slayer , was attached to the Tenth Sontaran Battle Fleet ' s Special Assault Squad . He was the lone survivor of a failed invasion of Earth by the Sontaran s and went on to serve the Bane as a mercenary . Biography . Avenging his race . After Luke Rattigan destroyed the Sontaran flagship ( TV : " The Poison Sky " ) , Kaagh ' s space pod was sent off course after the concussive wave from the ship hit it . ( PROSE : " The Last Sontaran " ) It crashed on the planet Earth . ( TV : " The Last Sontaran " ) Despite damage to the ship and exposure to G - force which might have killed him , Kaagh survived , but was badly wounded , as a piece of white hot metal had cut his left hand and some plastic shrapnel had torn through his face , from his eye to his mouth . ( PROSE : " The Last Sontaran " ) As a member of the Special Assault Squad , Kaagh ' s purpose was to infiltrate deep behind enemy lines to predict and anticipate their movements . Kaagh hoped that by doing this he could make up for his fleet ' s failure to conquer Earth . He began a covert attempt at destroying Earth and making himself a hero : " Kaagh the Avenger " , then " Kaagh the Destroyer " . Kaagh chose to use a nearby radio telescope to control the many satellite s orbiting Earth and send them plummeting into all the nuclear power plants . He distracted Professor Nicholas Skinner and his daughter Lucy and put them under his control with neural control implant s ; he wanted the Professor to act solely on his orders , while Lucy would be a sleeper agent to help him infiltrate potential enemies who might stop him . Soon after , Sarah Jane Smith , Luke Smith , Maria Jackson and Clyde Langer arrived to investigate the " lights " in the sky . These were actually drones Kaagh had used to lure out the Skinners . Kaagh watched from a distance , then confronted Luke and Clyde when they found his cloaked pod . However , they evaded him and brought Sarah Jane and Maria back to investigate . Kaagh revealed himself , his past and his plan of vengeance and hatred for the Doctor . Thinking two steps ahead of them , Kaagh pretended to pursue when they ran away , but soon followed them back to the telescope , where he found Sarah Jane about to disable the professor ' s implant with her sonic lipstick . Kaagh learned Sarah Jane was a good friend of the Doctor . He planned to take her back to Sontar to have her be punished in the Doctor ' s stead , after he had avenged his fleet . However , the children escaped and Kaagh was forced to hunt for them . He finally gave up and returned to the telescope to continue his plans . As he had expected , Kaagh captured Clyde and Maria when they tried to cut the power . However , Luke surprised him by deactivating the signal to cause the end of the world . Kaagh activated Lucy ' s implant and initiated Plan B . However , Chrissie Jackson arrived and stabbed his probic vent with her high heels , knocking him out and electrocuting her unconscious . After he woke , Kaagh was forced off Earth at gunpoint . Sarah Jane felt he would return . ( TV : " The Last Sontaran " ) Partnership with Mrs Wormwood . Too ashamed to return to Sontar , Kaagh worked as a mercenary for the Bane . They had found the consciousness of Horath and used Kaagh as a go - between for its transportation from planet to planet . A few weeks after this he met Mrs Wormwood , a member of the Bane family cast out for her actions . He learned there was a high price on her head , but she persuaded him to help her control the universe , which would be more fulfilling than simply serving the Bane . They plotted to become emperors of the galaxy . Mrs Wormwood travelled to Earth , closely followed by Kaagh , who came in during a siege by the Bane Kindred . He found Mrs Wormwood and killed her attackers . They stole Luke and the Tunguska Scroll , which would show them where Horath was buried . Luke escaped , but Kaagh caught him . However , Mrs Wormwood was growing tired of him . ( TV : " Enemy of the Bane " ) Betraying Mrs Wormwood . In the end , she offered Luke a place at her side and double - crossed Kaagh , calling him a blundering idiot . He saw the light . In a last ditch attempt at honour , he threw Mrs Wormwood and himself into the portal to Horath ' s body . ( TV : " Enemy of the Bane " ) Equipment . Kaagh displayed more advanced Sontaran technology than seen during the ATMOS factory attack . He had a more compact blaster weapon , which had settings , allowing him to either stun ( TV : " The Last Sontaran " ) or kill his target , with an additional option of disintergration . ( TV : " Enemy of the Bane " ) He kept his gun in a pocket which was connected to his leg . He also had an automatic helmet that could retract into his armour , and a personal cloaking field , a perception camouflage matrix . He employed neural implants , as opposed to the hypnosis Sontarans more commonly used , and used drones resembling large plasmic spheres as scouts , but also had attacking ability . ( TV : " The Last Sontaran " ) His communicator could be used to control his drone and neural control implant s . ( TV : " The Last Sontaran " ) It could also power other electronic weapons such as sonic disruptor s , ( TV : " Enemy of the Bane " ) and even tell Kaagh if there was someone on his ship . ( TV : " The Last Sontaran " )