Zod reveals that he intends to use a terraforming `` world engine '' to transform Earth into a new Krypton and use the codex to repopulate the planet with genetically-engineered Kryptonians , killing all of Earth 's indigenous life in the process .
Zod reveals that he intends to use a terraforming `` world engine '' to transform Earth into a Krypton-like planet , to eradicate the human population , and to use the codex to repopulate the planet with genetically-engineered Kryptonians .