Jack's Ancestors

Jack's Ancestors first appeared in Episode XVIII: Jack and the Ultra-robots, forging a katana on a cloud. Jack prayed to them to give his katana extra power so that he could destroy the last Ultra-bot. His prayer was granted and Jack successfully destroyed it forever.

Trivia

 * The four spirits that appear in Episode XCVII to witness Jack commit ritual suicide may be related to (or are) Jack's ancestors in spiritual form.