Ok so I probably saw this movie or show between 2005 and 2012, I don’t think it would be later than that or I would remember it better. It was live-action on Nickelodeon or something, but again I could be wrong about the network. From what I can remember about the plot there was some kind of school/prison/institution that a bunch of kids were at. The main antagonist (or possibly enforcer for the main antagonist?) was in one of those luchador Mexican wrestling masks or a mask that young me might find similar. I also feel like as punishment, these kids would be sprayed with some weird goo that petrified them. There was also maybe some twist like it was all a dream, the bad guy was protecting them, or something to do with a janitor? Not a super complicated twist but something shocking for a 5-10-year-old. Someone, please tell me this was not some fever dream because I have vivid snapshots of it in my head.