Cartoon Network is part of TIme Warner, and Hanna Barbera was purchased by Turner Broadcasting in the 90's, which Turner itself was purchased by Time Warner. DC Comics (where the superheroes come from) is also a subsidiary of Timer Warner.
Six Flags was also owned by Time Warner. I'm sure there was some sort of provision back when TW sold to Premier, and has stuck/been renewed since.
Explains a lot, doesn't it?