Nightmare Man
From Tardis Wiki, the free Doctor Who reference
The Nightmare Man was an alien from the Seretti dimension.
History
The Nightmare man was able to pass into the universe through the nightmares of Luke Smith. (SJA: The Nightmare Man)
Abilities
The Nightmare Man was able to damage K9 Mark IV and Mr. Smith for a short while. He was also able to place those awake into a sleep, and create nightmares in the minds of those who were already asleep. (SJA: The Nightmare Man)
