Major Zod is a younger clone of General Zod made twenty years before Krypton's destruction. During Zod's youth, blood samples were taken from him and his soldiers as part of an experiment to preserve the Kryptonian race in the event of Krypton's destruction. The blood samples were stored in the Orb; in 2009, Tess Mercer opened the Orb, which created the clones of Zod and his soldiers on Earth.
Season Nine introduces the return of General Zod as his younger self: Major Zod as a main character. It is revealed that before Krypton exploded, Zod duplicated his DNA when he was still a Kandorian Major, yet to commit the atrocities he is known for. Kelly Sounders remarks "over the course of the season, the venomous side of Zod rises because he experiences a few key betrayals with our beloved characters." Season Nine begins with Tess as Zod's prisoner in the Luthor mansion; he and many other depowered Kandorians live there. In "Metallo", Zod and his soldiers use LuthorCorp equipment to create the Supervillain Metallo (Brian Austin Green) using Kryptonian scientific knowledge. Zod only discovers that he is a clone in "Kandor". Lois, having been to the future, attempts to prevent a future where General Zod and the Kandorians, having regained their abilities, rule over Earth. In the episode "Disciple" he introduces himself to an injured Lois Lane. Clark uses his blood to revive a dying Zod in "Conspiracy"; it has the side effect of awakening Zod's abilities. Zod masquerades under Clark's superhero identity "the Blur" until Lois discovers the duplicity. Although Clark is able to convince Zod's followers to leave him when they learn he killed a pregnant Faora, Zod and Clark battle, both powerless due to the effects of Blue Kryptonite. The episode ends with Clark in freefall, and Zod ascending being taken out of Earth by the Kryptonian book of Rao.