Cosmic radiation was responsible for the creation of the Fantastic Four on Reed Richards' fateful space flight. Lack of sufficient shielding caused Reed Richards, Sue Storm, Johnny Storm, and Ben Grimm to receive exposure to cosmic rays in space. This led to lifelong mutagenic changes in the four.
Although Reed and the others believed that he had miscalculated the amount of necessary shielding, years later they learned that he had not. The storm was an attempt by the alien Entity to communicate, and the powerful denzien of the planet Spyre known as Revos directed the storm at Reed's spacecraft to prevent the flight from detecting and visiting Revos' planet. After realizing that the crewmates of the spacecraft survived their encounter with the cosmic rays and were granted powers, Revos took some of the radiation and tried to mutate a group of his own planet's citizens to grant them superpowers, just in case Reed and his crew ever tried to use their abilities to still come and attack the planet of Spyre.
The manipulation of cosmic rays has frequently been a part of Reed Richards's attempts to restore Ben Grimm to his human state. Reed himself used a cosmic radiation storm to recharge his own powers at a point when he had lost his elasticity. Another storm was responsible for further mutating Ben Grimm for a time, along with his partner Ms. Marvel.
The cosmic radiation that transformed the Fantastic Four is usually deadly to humans. It would have killed Jean Grey when she interacted with it, had not the cosmic entity known as the Phoenix Force intervened..
Other individuals have occasionally tried to recreate the cosmic ray event in order to gain powers for themselves, with varying success. The Red Ghost and his Super-Apes as well as the U-Foes all succeeded in becoming cosmically empowered after the Fantastic Four.
Cosmic Rays have been shown to cancel out Gamma energy or act as a kind of Anti-Gamma and was used by the U-Foes to weaken the Hulk and keep him dead. 
- A solar flare caused the Van Allen Belts to be charged with ultra-high levels of cosmic radiation during the Fantastic Four's fateful spaceflight.
- See also: Fantastic Four #1
- It has been hinted at during the Immortal Hulk series that just as Gamma energy is used as a tool for the One Below All (Multiverse) to empower it's chosen, Cosmic energy as it was featured prominently in Immortal Hulk events involving the rebirth of the cosmos, the creation of a being like Galactus for each new cosmos, and the retelling of the origin of the Fantastic Four which established Marvel as a publisher, Cosmic energy is used as a tool by the One-Above-All (Multiverse).
Cosmic Ray Enhanced Characters:
- See also: Category:Cosmic Ray Exposure
- Mister Fantastic
- Invisible Woman
- Human Torch
- Red Ghost
- Sharon Ventura
(See Also: Wikipedia article)
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