[quote]In comic books published by Marvel Comics, a mutant is an organism (usually otherwise human) who [b]possesses a genetic trait[/b] called an X-gene that allows the mutant to naturally develop superhuman powers and abilities.[/quote]

[quote=GrandDM2]
Geoff's mother was a scientist studying the inner workings of the universe. During an experiment, she and her unborn son were exposed to large amounts of cosmic energy. It made his mother ill, and she died in childbirth, but Geoff's young, malleable DNA was permeated with the Power Cosmic and, through bonding with it, survived. ...

.... Now in full possession of his abilities, he sought out other mutants to help them as the Surfer had helped him.
[/quote]

@GrandDM2 - How is Geoff a mutant exactly?
His origin doesn't match Marvel's definition of what makes a mutant a mutant. Geoff's origin is less X-Men and more Fantastic Four.