Hall-9000

Hall-9000 (Originally called Hal-9000) is a robotic security system that appears as the main antagonist of Hall 9000. What's interesting is, he actually appeared in a movie called Space Odyssey the exact same appearance and acted the exact same way.

Appearance
Hall-9000 was the advanced security system placed in the castle. At first things started to work well, as bad guys couldn't get in the place, but pretty soon Hall was doing sexual things with the intruders like rapage and going too far with safety, and eventually malfunctioned and thinking everyone in the castle was an intruder, kicked them out and took over the castle (LOL). Mario and SuperMarioGlitchy4 had to get past all the traps (laser beams, sentry robots, etc.) and go to the main computer room, which was the room with the Tiny-Huge Island painting. Mario destroyed the machine and Hall-9000, along with all its evil sinister security, died out. He did appear as a cameo flashback in Smg3's plan to destroy Smg4 because he felt like it.

Trivia
Hall-9000 was from the movie Space Odyssey and also malfunctioned in that movie, too.