Brothers.
Lord Kal-El often enjoyed his trips to visit Bruce Wayne. Their 20 years of friendship ends when Seperist ships assault Naboo and Coruscant in a coordinated assault, leaving millions dead - including Bruce's parents.
Learning of Kal-El's part to play in the manufacturing of invincible droids, Bruce Wayne returns to his retired vigilante persona, on a quest for justice...
Meanwhile, Palpatine raises a young Anakin Skywalker to become a Grey Jedi, under the tutelage of Qui-Gon Jinn. And their first mission is one that will put Anakin on the radar of many powerful figureheads.