Jack tried to obtain the gems when he heard that they could help him go back in time, due to the fact Cronus had control over human time, by a mysterious hermit. After obtaining the three gems, the hermit revealed himself as Aku and used the gems to revive Cronus. However, Jack knew it was Aku the whole time, and kept one of the jewels, weakening the pseudo-Titan and destroying it. Aku then tried to use the power himself, but was defeated and ran away. Jack then gathered the three gems and went on his way.