Spectacle creep
A phenomenon occurring when the creator/creators of certain a media franchise (in games, movies, comics, etc) try to keep things fresh and interesting by unwisely making everything bigger, better and more spectacular. This can lead to the feeling that everything up to that point didn't really have a point or that everything after this point is pointless since it's just so ridiculously over the top.
"First Gotham, then the world!"
Mr. Freeze on Spectacle creep
Mr. Freeze on Spectacle creep