Westworld facility, 1997
The demon Jareth took care of the dead bodies of the DELOS workers and guests. Only one loose end remained to be taken of; the solo surviving guest, Peter Martin. He appeared out of nowhere in front of the human, before Jareth smiled evilly at Peter.
"What the hell are you?!" Peter demanded.
"I'm a demon. Now you will die. I can't have any loose ends, after all." He grabbed Peter by the neck, and the man burst into flames.
Jareth used his powers to wipe away the traces of what had happened; so that no one could find out about the robots going rogue, killing the guests do to a computer virus. Returning to the Hellmouth, he put some robot spies among the Scooby gang.
The robots replaced Willow and Oz. The real Willow and Oz were taken around the time Buffy came to Sunnydale...
Two years later after the covered-up incident at the amusement park, Jareth took over DELOS completely. To him, human minds were a lot easier to control than demon minds. He sat in his office, wearing a dark blue suit with a black tie. Ethan Rayne came in and sat across from him. Ethan was dressed in red sweatshirt and blue jeans.
"Status report," Jareth demanded.
"All is progressing according to plan. Has the Slayer figured out two of her friends aren't human yet?" Ethan asked with a grin.
"No. That idiot Slayer has no idea I've been spying on her for the last two years. I have both Willow Rosenberg and Daniel Osbourne here in a hidden room."
"Really, Jareth?"
"I'll show you, Ethan."
They got out of the leather chairs and headed towards a book case. Jareth removed a book off the shelf and the book case moved to the side, to reveal a metal sliding door. Next to the metal door was a hand scanner. The demon put his hand on the hand scanner, and the metal door then slid open. In the hidden room were two human size tanks. In the tanks were Willow and Oz, floating in suspended animation.
Ethan had a puzzled look on his face. "I still don't see why you don't just kill them."
"I need them alive to supply the robots their memories. So the robots act more human."
"Not a bad idea," Ethan said with an evil smile. "What about the Slayer's other friend, Xander Harris?"
"All is progressing according to plan with him as well. I did give you the Gunslinger costume to sell him that night," Jareth chuckled darkly.
Indeed, back on Halloween 1997, Xander, Willow and Buffy had been at Ethan's store looking for something good to wear; and Harris had become the Gunslinger that night...
The android's resulting kill count had almost been enough to send Harris into an asylum, afterwards!