Darius Pike Darius was a fifteen - year - old boy who was employed as Professor Gryffen ' s personal assistant by the Department . He was also part of K9 Mark 2 ' s alien - fighting team . Darius was the son of police officer Harry Pike . Harry often brought Darius to his precinct house , which would later become Gryffen Manor . After the Department ' s CCPC s made human police obsolete , Harry became obsessed with revenge . Harry left Darius and Darius ' mother to focus on his obsession . ( TV : " The Last Precinct " ) Darius was employed by the Department to keep an eye on the Professor . He was also his personal assistant and tended to his car , Mariah . He met criminals , Starkey and Jorjie , after encountering K9 and Jixen . He informed the CCPCs . He went with K9 to rescue Starkey , though he still didn ' t like him . ( TV : " Regeneration ) " He once almost destroyed London when he accidentally unleashed a swarm of alien nanobots . ( TV : " Black Hunger " ) An accident in the STM resulted in Jorjie being sent to 23 November 1963 . K9 and Starkey were sent to retrieve her . They encountered Darius ' great - grandfather , William Pike and saved him from the clutches of Barker , a MI6 agent with a surprising resemblance to Thorne , preventing Darius from being erased from history . Gryffen , with June ' s help , brought them back . ( TV : " The Cambridge Spy " ) Like almost all of Britain ' s kids , Darius was a huge fan of the latest VR game , Little Green Men . Darius , Jorjie and millions of other children , were almost turned into Etydion s until June convinced the last Etydion to stop what he was doing . ( TV : " The Custodians " ) Darius met his estranged father when his father and his father ' s group , the Last Precinct , attacked Gryffen Manor , using it as a staging ground for their plans to disgrace the CCPCs . Although Darius helped derail those plans , leading to the arrest of the members of the Last Precinct , he and his father parted on civil terms . ( TV : " The Last Precinct " ) Soon after , Darius was approached by Thorne , who claimed that his father was suffering in prison . Thorne offered to make his sentence more bearable in return for K9 ' s regeneration unit . Darius convinced K9 to go along with it , only to be double - crossed by the group . ( TV : " Hound of the Korven " ) When a strange phenomenon in the STM threatened Earth , Gryffen sent Darius to collect June . Shortly after , CCPCs in the area were given new orders that human personnel had no authority . When the two were confronted by two CCPCs , June saved Darius by grabbing a large gun and destroying them . They made their way to the STM control panel . Darius pulled June back just as the STM exploded , saving her life . This act of heroism earned June ' s respect , and she offered him a position in a new Department . Darius later heard that K9 was about to die . A tearful Darius told him he was the coolest thing to ever happen in his life . As per its programming , K9 ' s regeneration unit homed back to him , allowing him to renew himself . Darius was delighted to see him alive again . ( TV : " The Eclipse of the Korven " ) Personality . Darius was a hard worker , and loyal to the professor , whom he saw as a father figure . Being an employee of the Department , he did not dislike and distrust them as much as Starkey and Jorjie . He would willingly go to them for help on occasion . ( TV : " Jaws of Orthrus " ) He showed great care for Gryffen , comforting him at bad times ( TV : " Regeneration " ) and going off to rescue him when he was kidnapped . ( TV : " The Korven " ) He initially disliked Starkey , believing his troublemaking ways would only bring the Professor strife , but they became good friends . Darius and K9 sometimes argued . ( TV : " Jaws of Orthrus " ) He had a crush on Jorjie ( TV : " Sirens of Ceres " ) , and was heartbroken when she confessed to him she had a crush on Starkey . ( TV : " Aeolian " ) He was very attached to Mariah , spending most of his free time polishing and working on her and was angry when it appeared K9 had damaged her . ( TV : " Jaws of Orthrus " ) Furthermore he loved to play the electric guitar . ( TV : " Aeolian " ) Darius was something of a pragmatist , abandoning his friends ' plans when they seemed too outlandish or likely to fail and seeking help elsewhere . He also had a habit of concocting get - rich - quick schemes , usually involving alien technology . ( TV : " Black Hunger " ) Darius suffered from claustrophobia ( TV : " Fear Itself " ) and coulrophobia . ( TV : " Dream - Eaters " )