[Potato]

Before the Batman Beyond started, there was no such thing as Terry McGinnis and etc. There were plenty of "future batmans", but none of them involved the characters from Beyond. It was only a few years later, that they officially made Beyond canon and part of the official DC universe.

*edit*, yeah..that opening still holds up. R.I.P. Shirley Walker...she was the one that pretty much taught Danny Elfman how to compose for movies and etc. Before her, Danny Elfman didn't know how to read music. Great rocker, but not composer yet.