Samurai Jack, Devil Jane, and Angel Demon!

Jack has come to terms with the various obstacles that come between him and his destiny. Powerful Demons, Alien Assasins, Bounty Hunters, all will fall by his Magical Blade, and with the help of his Good Demon Friend Zenzu, this should've been an easier task...so, why was he forced to act as a babysitter to Aku's Child, who won't stop trying to kill him every second of the day?