Board Thread:General Discussion/@comment-25473181-20150228162458/@comment-26142953-20150228173054

Unless the Marble Madness episode proves otherwise, I've got three theories for what that green glow signifies:

1. Peridot has returned and Steven is flabbergasted by her. Evidence, preview clips have shown flask robonoids and a giant one in particular, plus Peridot is green.

2. Centipeetle Mother returns and Steven brings centipeetle to kindergarten in a attempt to uncorrupt her. That glow represents his efforts were successful.

3. A whole new gem character is revealed. The episode is returning to kindergarten and there were a lot of gem holes, perhaps one still had a newly created gem there.