Mercurio is a native of the planet Gramos, a world threatened with extinction when a gravitational distortion blocks out all sunlight. In a bid to save Gramos, Mercurio was chosen to project his consciousness across the galaxy to Earth, where he takes control of a wealthy landlord and uses his resources to build a device to siphon off Earth's electromagnetic field. Mercurio also detects strange energies coming from the offices of Dr. Donald Blake, the alter-ego of the Thunder God Thor. Witnessing a transformation from Blake to Thor, Mercurio siphons off some of the magical energy in attempt to transport his body across space to Earth. The process is only partially successful as the left side of Mercurio's body is turned blue-black and his normal fire-generating ability is reverted to ice (on the left side only). Mercurio then battles Thor but is quickly defeated.
Several weeks after returning to Gramos, Mercurio led an army to find the God Jewel, a gem containing enough energy to sustain Gramos forever. The God Jewel, however, proved to be sentient and evolved into a humanoid form called Xorr, and was capable of sucking the life energy from any source. Coincidentally, Thor and several allies were also seeking the God Jewel as it had imprisoned two Asgardian goddesses. With Thor's help Xorr was defeated, and Mercurio retrieved several fragments of the God Jewel for use on Gramos.
Although Gramos was saved, Mercurio developed a desire to conquer, and attempted to trick Captain Marvel into visiting Gramos and building the Omni-Wave Projector - a device capable of emitting energies on a galaxy-wide scale. Captain Marvel's cosmic awareness, however, warned him of the trap and, after defeating Mercurio, he returned to Earth.
As part of his delusions of conquer, Mercurio began to amass weapons from over the galaxy. He also hired the pirate Kio to acquire chemical weapons and had inserted a drill to retrieve resources from the planet of the P'qui. Both of his plans were foiled by Venom.
As part of an intricate plan, Venom and Pik Rollo traveled to Mercurio's base. Rollo pretended to double-cross Venom, allowing Mercurio's soldiers to strip him of the symbiote. Mercurio donned the creature, believing to have turned it to his side. However, after bonding with Mercurio to do a recon mission and learn of the villain's armada, the symbiote returned to Venom.
Numerous of the allies that Venom had made in his space adventures joined forces to destroy Mercurio's armada and base, forcing the villain to retreat, vowing to have revenge on the symbiote and its host.
As a native of the planet Gramos, Mercurio possesses the ability to generate intense heat, usually in the form of a fireball or wall of flame. As a result of his "accident", Mercurio can now emit intense cold from the left side of his body. He is also able to use both abilities simultaneously. Mercurio also possesses enhanced strength and flight, although it is not known whether the latter is an innate ability or is achieved via technological means.
- 19 Appearances of Mercurio (Earth-616)
- Media Mercurio (Earth-616) was Mentioned in
- 6 Images featuring Mercurio (Earth-616)
- 1 Quotations by or about Mercurio (Earth-616)
- Character Gallery: Mercurio (Earth-616)
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