Bleach

Season 1, Episode 6

Episode Title: Fight to the Death! Ichigo vs. Ichigo

Air Date: 2004-11-09

Overview:

At Rukia Kuchiki's behest, Ichigo Kurosaki puts an artificial soul in his body to take care of it and not arouse suspicion while he carries out his Substitute Shinigami duties, but the artificial soul has its own agenda.