S2·E7 Enter the Dragon

Dojo's craving for Shen-Gong-Wu reaches the breaking point, which causes chaos for everybody. It happens every 1500 years, and Dojo must be locked in a cage for 24 hours to calm down. This doesn't last long, however, as Dojo tricks Omi and goes loose. Growing a second head, Dojo becomes evil and goes on a rampage throughout China searching for Shen-Gong-Wu.