The Nightmare Man

The Nightmare Man was a Vishklar from the Seretti dimension who terrorised humans in their dreams.

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.

_{Biography from the TARDIS Data Core article, licensed under CC-BY-SA}