OverthinkingIt podcast discussed this subject. http://www.overthinkingit.com/2013/06/17/otip-episode-259/ Krypton stuff starts at 20:12. "General Zod's plan is to eradicate the bloodlines of those he finds responsible for Krypton's fate. Everyone else gets relocated to another planet. Meanwhile Jor-el's plan kills everybody. And Zod is the villain. "