The body dies... but the spirit lives on.
Zemus is the main antagonist of Final Fantasy IV. He is a Lunarian who wants his brethren to come out of their long slumber and populate the Earth. He has formidable mind-control powers that he uses to manipulate various individuals, especially those with Lunarian blood.
Zemus's main power is his ability to control the minds of others remotely, particularly Golbez and Kain Highwind (indirectly). Strong feelings can interrupt this power for a time, as seen when Kain is stopped by Rosa from killing Cecil. Fusoya can break Zemus's control over Golbez and make him remember his true identity.
Zemus appears to have been the only voice among the Lunarians advocating world domination. The rest wanted to wait for the people of Earth to evolve to the point where the two races could coexist. Zemus was forced to sleep, and the Red Moon's crystals sealed him within the moon, but because of his immense psychic powers, his mind remained awake and searched for ways to realize his plan. He manipulated the Lunarian Kluya's son, Golbez, and used him to achieve his goals.
Zemus manipulates Golbez into summoning the Giant of Babil, a massive android capable of eliminating life from the planet to make way for the Lunarians. When the crystals are gathered and the Giant roams the Earth, the Lunarian Fusoya, Kluya's other son Cecil, and their allies infiltrate the Giant and destroy its central processing unit. Fusoya breaks Zemus's mind control over Golbez. Furious at being made to commit atrocities, Golbez swears to kill Zemus and leaves with Fusoya for the Lunar Core.
In the ensuing battle, Zemus resists Golbez's and Fusoya's spells and taunts them into killing him by casting Meteor. Despite Zemus's death, his hatred lives on as Zeromus. Cecil and his allies, with the help of the prayers of their supporters on Earth, vanquish Zeromus, ending his threat for good.
Zemus is a cutscene battle where Fusoya and Golbez join forces to fight it. The battle is purely cinematic.
Zemus appears as a card in the Final Fantasy Trading Card Game.
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- One piece of unused dialog for Zemus exists: "You are entering into my realm, the Zemus-Zone. No one can ever escape from my minions! Perish in the Darkness before you reach me." This speech is given by Zemus, taunting the party telepathically. This was probably intended to be displayed upon entering the Lunar Subterrane or the Lunar Core. The "Zemus-Zone" is a reference to Rod Serling's The Twilight Zone and also an unused location name, but may have been the working name for the Lunar Core during the English localization.
- The party being defeated by the final boss and then revived by their allies alludes to a similar scene in Final Fantasy III.