Dr. Hudson is a Phantom Wraith who had the power of mind control in the WB/CW TV series Smallville. He served as the main antagonist in the Season Six episode "Labyrinth".
He was portrayed by Matthew Walker.
His real name and background was a mystery, but at some point before Krypton's destruction, Dr. Hudson performed destructive actions that landed him in the Phantom Zone. In the Zone, he was stripped of his physical form and rendered bodiless, and thus took the form of a Phantom wraith.
In 2006, Dr. Hudson was among the prisoners freed from the Phantom Zone, when Clark Kent escaped from it. His destination was unknown until he made his way to Smallville. The Phantom attacked Clark at the Kent Farm when he finishing up his chores and trapped him in a nightmare world, where Clark was a patient at a mental hospital and his abilities were a figment of his overactive imagination.
In the illusion, Clark thought he was a prisoner in Level 33.1 and that he had been captured by Lex Luthor. Dr. Hudson tells him that, in fact, he has been suffering from paranoid schizophrenia for over five years now. Hudson explained that Clark had created an elaborate fantasy in which he was an alien with superpowers, and during his freshman year of high school, began to live in this fantasy all the time.
Clark refused to believe any of this, but Dr. Hudson patiently said he has developed a treatment that will soon cure him. He was aware of every single memory within Clark's mind and therefore able to optimize the alternate reality which he had created. In actuality, the "cure" would allow Dr. Hudson to take complete control of Clark's mind and body with all of his Kryptonian powers. Clark managed to escape the facility but after running into Lana, his mother, Lex and seeing Chloe die, he reluctantly returned to the asylum.
Dr. Hudson later tells him that he will be fine after his treatment. Clark insists he is not going to go through with it, but Dr. Hudson begins to show Clark that all of the circumstances and people that Clark thinks makes up his Kryptonian background have been taken from ordinary objects in his everyday world. He shows Clark a piece of meteor rock and Clark automatically jumps back in fear. When Dr. Hudson shows Clark that the rock is harmless to him, Clark seems to realize that Dr. Hudson is really telling the truth. He realizes Chloe is really dead and slides to the ground in defeat.
The Martian Manhunter telepathically entered Clark's mind and explains that Dr. Hudson is a Phantom Zone prisoner trying to gain control of Clark's body by controlling his mind unless Clark fights back. He also states that in order for Clark to regain consciousness, he must kill Dr. Hudson. Clark is taken to the treatment room where Lana is waiting. She convinces him to take the treatment and be normal and with her for the rest of their lives. They strap Clark to a table and Dr. Hudson starts up a drill.