While traveling in the desert, Joe's Tag react, leading the group into a Roman-like coliseum. There, they are trapped by Etemon and Greymon is forced to fight another Greymon. After Joe finds his Crest of Reliability, the group escapes, and Tai attempts to force Greymon to Digivolve. Greymon Digivolves into SkullGreymon and loses control of himself and attacks the others, who are unable to stop him. SkullGreymon eventually runs out of energy and reverts to Koromon and apologizes for his behavior.