I don't know of any big news on Superman so I would think that it moved because of reset. Every night at 3:00a EST all stocks are set to zero. Some traders will be around and wait for the first stock to move. HSX has a program traders call "The Twins". The Twins keep the market moving so that it does not stagnate. So, even when traders are not trading, stocks will move. Traders that sit there waiting are called"reset traders" and their trading not only reacts to news but also to the artificial movement created by the Twins.
Depending on what type of trader you want to be, you can either trade on those reset movements or ignore them. I personally enjoy knowing more about movies so I trade on the news and the box office results AND I enjoy building a big portfolio. So reset is part of the game to me.
I did not play reset last night but checking with resetters, Superman was one of the first movers last night.
You can check out this board for some good info on strategy. You can also ask questions which usually get answered pretty quickly if we are able to. Lotta helpful folks on here. Lotta folks have played this game in all its incarnations for quite a while. I have been around for almost 3 years and know how to grow a port fast but don't know half the stuff some of the guys around here do.

Good luck and happy trading!