Protheans experimented on primitive humans. They designed one subject, Kal-El, for one purpose: destroy Brainiac, the machine which wipes out galactic civilization every 50,000 years. Kal-El woke to find the Protheans extinct and Brainiac gone. He has waited millennia, and now emerges to fight. The Systems Alliance and Cerberus grow ever ambitious, while racial tensions rise.