Nightmare Man The Nightmare Man was a Vishklar from the Seretti dimension who terrorised human s in their dream s . Biography . The Nightmare Man was , at first , an immaterial being from another dimension . He was attracted to the universe by the mind of Luke Smith , which he planned to use to pull himself into the universe . He manifested himself in the universe through the nightmares of Luke Smith , using Luke ' s powerful mind and trapping Luke in the dream dimension . Once in the universe , he placed Clyde and Rani in a nightmares and began to induce nightmares in the sleeping population to feed himself . When some of his power was cut off by Luke pulling Clyde and Rani out of their nightmares to join him , he went back to Sarah Jane ' s house and short - circuited K9 and Mr Smith . After almost being tricked by Sarah Jane to place her in a nightmare so she could join them , he travelled back to Luke ' s nightmare . He tried to send Clyde and Rani back into their nightmares . He was defeated when Luke , Clyde and Rani shrugged off their fears and stood against him . As they didn ' t fear him , he lost his power over them and weakened . The Nightmare Man was imprisoned in a nightmare of his own , listening to his dream version of Sarah Jane Smith telling him how wonderful her son was for the rest of eternity . ( TV : " The Nightmare Man " ) Personality . The Nightmare Man was sinister , dark , enigmatic , malevolent and cruel . He demonstrated incredible sadism , taunting Luke that all which was happening was Luke ' s fault . Displays of psychotic personality traits were his almost laid - back and carefree behaviour , even in the face of people equal to him . One personality flaw proved to be his downfall : arrogance . Underestimating Luke and his friends allowed them to defeat him . ( TV : " The Nightmare Man " ) Abilities . He was an extraordinarily powerful entity . The Nightmare Man was able to visit Luke in his nightmares , and draw power from nightmares . He was able to control others ' dreams , and possess their minds , giving him limited control over them . With enough power , he could physically manifest himself into the universe . Once he had , he gained far greater powers . He could make those awake sleep and create nightmares in the minds of those already asleep , feeding off their fear . The range of his powers also greatly increased . He could have sent the whole world to sleep . He could fire offensive energy blasts that damaged K9 and cause Mr Smith to short circuit by pointing at him . He could teleport around the real word and back into the dream world . He could control people while they were asleep , as long as they feared him . Those he created nightmares for might enter the same dream as others with intense concentration , which caused him pain . As he fed off all nightmares that every man , woman and child ever had , he also knew all their nightmares and knew about everyone . His power to create nightmares was so great he could make Luke have nightmares , even though Luke did not otherwise dream . Even before he physically manifested himself , he could control dreams . Once he physically manifested , he could control more than one dream to the same level at once . He needed fear to fuel his powers . Otherwise , he was powerless , much like Elijah Spellman . ( TV : " The Nightmare Man " )