Stewart Cadwall was a Hollywood screenwriter whose career was not going well. While he was arguing with his agent, he inadvertently attracted the attention of the omnipotent alien the Beyonder, who had travelled to Earth to study humanity. Cadwall was impressed by the Beyonder's powers, so the Beyonder imbued him with powers of his own. A lightning-shaped award Cadwall was clutching was transformed into a sword, and Cadwall imagined a more powerful, armored form for himself, along with a winged horse to ride, and called himself Thundersword.
Thundersword left a path of destruction in his wake, attacking a television studio and fast food outlets. He was soon opposed by members of the X-Men, New Mutants, Dazzler, and the Avengers Captain America and the then Iron Man. Captain America disarmed Thundersword, turning him back into his physically unimpressive normal form. Cadwall was taken into police custody.
However, Cadwall soon realized his power was not dependent on his sword, and transformed into Thundersword, breaking out of jail. Iron Man fought him again, unsuccessfully, until thanks to a power boost from an electrical generator, he was able to send him into the Pacific, defeating him.
After being released from prison on parole, Cadawall led a peaceful life with a wife and two children in Van Nuys, California until Captain Marvel and Alpha Flight arrested him for keeping his lightning-shaped trophy. A vision from the Inhuman precog Ulysses Cain had foretold an energy emanation from Cadawall's home was going to cause a tragedy. When Captain Marvel raided his house, it was discovered unnatural energy was building up withing the lighting-shaped trophy, but hadn't reached dangerous levels at the time.
Cadwall was given the power by the Beyonder to transform himself into a more physically impressive form, complete with superhuman strength. As part of this transformation, he was able to give himself a set of golden protective armor, a lightning-shaped sword that was able to rend materials like brickwork, and a winged horse that he could ride. Whether Cadwall was able to imagine other weapons and equipment for himself is unknown.
As Thundersword, Cadwall had superhuman strength. In his normal form, he had the regular human strength of a man of his age, height, and build who engaged in little regular exercise.
As Thundersword, Cadwall wielded a lightning-shaped sword.
As Thundersword, Cadwall rode a winged horse named Boromir.
- This character was based on Steve Gerber.
- 6 Appearances of Stewart Cadwall (Earth-616)
- Media Stewart Cadwall (Earth-616) was Mentioned in
- 2 Images featuring Stewart Cadwall (Earth-616)
- Quotations by or about Stewart Cadwall (Earth-616)
- Character Gallery: Stewart Cadwall (Earth-616)
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