Once every 1,500 years, Dojo must be locked up for 24 hours. If he gets out, he will travel the globe, devouring every Shen Gong Wu he can find, along with everything else in his path. It will be the beginning of the end. Omi is given the responsibility to make sure this doesn't happen.
click here to see where to watch or (watch here).
Ready to Watch Xiaolin Showdown, Season 2, Episode 7?